Ref#
Year designated
Name
Image
Built
LocationCoordinates
Region/state
Country
Category
1
1966
Bollman Truss Bridge
1869
Savage 39°8′5.4″N 76°49′30.3″W / 39.134833°N 76.825083°W / 39.134833; -76.825083 (Bollman Truss Bridge )
Maryland
United States
bridges
2
1967
Bidwell Bar Bridge
1856
Oroville 39°32′14.8″N 121°27′15.6″W / 39.537444°N 121.454333°W / 39.537444; -121.454333 (Bidwell Bar Bridge )
California
United States
bridges
3
1967
Erie Canal
1825
Hudson River to Lake Erie 43°2′35.6″N 76°1′20.2″W / 43.043222°N 76.022278°W / 43.043222; -76.022278 (Erie Canal )
New York
United States
water transportation
4
1967
Middlesex Canal
1803
Middlesex County 42°30′21.4″N 71°9′25.8″W / 42.505944°N 71.157167°W / 42.505944; -71.157167 (Middlesex Canal )
Massachusetts
United States
water transportation
5
1968
Central Pacific Railroad
1863–1869
Sacramento eastward38°34′57″N 121°30′22.8″W / 38.58250°N 121.506333°W / 38.58250; -121.506333 (Central Pacific Railroad )
California
United States
roads & rails
6
1968
Durango-Silverton Branch of the D&RGW RR
1882
Durango 37°35′27.7″N 107°46′41.6″W / 37.591028°N 107.778222°W / 37.591028; -107.778222 (Durango-Silverton Branch of the D&RGW RR )
Colorado
United States
roads & rails
7
1968
Ellicott's Stone
1799
Mobile 30°59′52″N 88°1′21.1″W / 30.99778°N 88.022528°W / 30.99778; -88.022528 (Ellicott's Stone )
Alabama
United States
surveys & maps
8
1968
Acequias of San Antonio
1718
San Antonio 29°19′57.1″N 98°27′41.1″W / 29.332528°N 98.461417°W / 29.332528; -98.461417 (Acequias of San Antonio )
Texas
United States
water supply & control
9
1968
Joining of the Rails - Transcontinental Railroad
1869
Promontory 41°37′4.7″N 112°33′5.8″W / 41.617972°N 112.551611°W / 41.617972; -112.551611 (Joining of the Rails - Transcontinental Railroad )
Utah
United States
roads & rails
10
1968
Wheeling Suspension Bridge
1849
Wheeling 40°4′12.8″N 80°43′36.7″W / 40.070222°N 80.726861°W / 40.070222; -80.726861 (Wheeling Suspension Bridge )
West Virginia
United States
bridges
11
1969
Alvord Lake Bridge
1889
San Francisco 37°46′8.4″N 122°27′17.6″W / 37.769000°N 122.454889°W / 37.769000; -122.454889 (Alvord Lake Bridge )
California
United States
bridges
12
1969
Charleston - Hamburg Railroad
1833
Charleston to Hamburg 32°47′22.9″N 79°56′15.8″W / 32.789694°N 79.937722°W / 32.789694; -79.937722 (Charleston - Hamburg Railroad )
South Carolina
United States
roads & rails
13
1970
Ascutney Mill Dam
1834
Windsor 43°28′35″N 72°23′44.5″W / 43.47639°N 72.395694°W / 43.47639; -72.395694 (Ascutney Mill Dam )
Vermont
United States
dams
14
1970
Bridgeport Covered Bridge
1862
Nevada County 39°17′34.2″N 121°11′41.7″W / 39.292833°N 121.194917°W / 39.292833; -121.194917 (Bridgeport Covered Bridge )
California
United States
bridges
15
1970
Cornish–Windsor Covered Bridge
1866, rebuilt 1988
Windsor to Cornish 43°28′25.3″N 72°23′2.1″W / 43.473694°N 72.383917°W / 43.473694; -72.383917 (Cornish–Windsor Covered Bridge )
Vermont and New Hampshire
United States
bridges
16
1970
Frankford Avenue Bridge
1697
Philadelphia 40°2′36.7″N 75°1′14″W / 40.043528°N 75.02056°W / 40.043528; -75.02056 (Frankford Avenue Bridge )
Pennsylvania
United States
bridges
17
1970
Potowmack Canal and Locks
1799
Great Falls 38°59′25.3″N 77°14′58.1″W / 38.990361°N 77.249472°W / 38.990361; -77.249472 (Potowmack Canal and Locks )
Virginia
United States
water transportation
18
1970
Theodore Roosevelt Dam & Salt River Project
1911
33°40′17.9″N 111°9′40.8″W / 33.671639°N 111.161333°W / 33.671639; -111.161333 (Theodore Roosevelt Dam & Salt River Project )
Arizona
United States
water supply & control
19
1970
Union Canal Tunnel
1828
Lebanon 40°20′58.5″N 76°27′41″W / 40.349583°N 76.46139°W / 40.349583; -76.46139 (Union Canal Tunnel )
Pennsylvania
United States
water transportation
20
1971
Bethlehem Waterworks
1761
Bethlehem 40°37′8.7″N 75°22′58.2″W / 40.619083°N 75.382833°W / 40.619083; -75.382833 (Bethlehem Waterworks )
Pennsylvania
United States
water supply & control
21
1971
Druid Lake Dam
1871
Baltimore 39°19′7″N 76°37′53″W / 39.31861°N 76.63139°W / 39.31861; -76.63139 (Druid Lake Dam )
Maryland
United States
dams
22
1971
Eads Bridge
1874
St. Louis 38°37′44″N 90°10′43.3″W / 38.62889°N 90.178694°W / 38.62889; -90.178694 (Eads Bridge )
Missouri
United States
bridges
23
1971
First Owens River - Los Angeles Aqueduct
1913
Owens Valley 36°58′32.4″N 118°12′38″W / 36.975667°N 118.21056°W / 36.975667; -118.21056 (First Owens River - Los Angeles Aqueduct )
California
United States
water supply & control
24
1971
Mormon Tabernacle
1867
Salt Lake City 40°46′13.6″N 111°53′35.3″W / 40.770444°N 111.893139°W / 40.770444; -111.893139 (Mormon Tabernacle )
Utah
United States
buildings
25
1972
Cabin John Aqueduct
1863
Cabin John 38°58′22″N 77°8′54.9″W / 38.97278°N 77.148583°W / 38.97278; -77.148583 (Cabin John Aqueduct )
Maryland
United States
water supply & control
26
1972
Chesbroughs Water Supply System Chicago
1869
Chicago 41°53′49.8″N 87°37′27.9″W / 41.897167°N 87.624417°W / 41.897167; -87.624417 (Chesbroughs Water Supply System Chicago )
Illinois
United States
water supply & control
27
1972
Brooklyn Bridge
1883
New York City 40°42′22″N 73°59′48.8″W / 40.70611°N 73.996889°W / 40.70611; -73.996889 (Brooklyn Bridge )
New York
United States
bridges
28
1972
Gunnison Tunnel
1909
Montrose 38°29′36″N 107°43′17″W / 38.49333°N 107.72139°W / 38.49333; -107.72139 (Gunnison Tunnel )
Colorado
United States
tunnels
29
1972
Roebling's Delaware Aqueduct of the Delaware & Hudson Canal
1848, restored 1983
Lackawaxen to Minisink Ford 41°28′57.5″N 74°59′4.1″W / 41.482639°N 74.984472°W / 41.482639; -74.984472 (Roebling's Delaware Aqueduct of the Delaware & Hudson Canal )
Pennsylvania & New York
United States
water transportation
30
1972
Miami Conservancy District
1922
near Dayton 39°45′49.2″N 84°11′29.2″W / 39.763667°N 84.191444°W / 39.763667; -84.191444 (Miami Conservancy District )
Ohio
United States
water supply & control
31
1973
Buffalo Bill Dam
1910
Cody 44°30′5.3″N 109°10′59.4″W / 44.501472°N 109.183167°W / 44.501472; -109.183167 (Buffalo Bill Dam )
Wyoming
United States
dams
32
1973
Cheesman Reservoir
1905
Southwest of Denver 39°12′27″N 105°16′20.1″W / 39.20750°N 105.272250°W / 39.20750; -105.272250 (Cheesman Reservoir )
Colorado
United States
dams
33
1973
Embudo Stream Gauging Station
1889
Embudo 36°12′18.4″N 105°57′49.2″W / 36.205111°N 105.963667°W / 36.205111; -105.963667 (Embudo Stream Gauging Station )
New Mexico
United States
water supply & control
34
1973
Ingalls Building
1903
Cincinnati 39°6′1″N 84°30′45.1″W / 39.10028°N 84.512528°W / 39.10028; -84.512528 (Ingalls Building )
Ohio
United States
buildings
35
1973
Pelton Impulse Water Wheel
1878
Camptonville 39°27′7″N 121°2′55″W / 39.45194°N 121.04861°W / 39.45194; -121.04861 (Pelton Impulse Water Wheel )
California
United States
power generation
36
1973
Starrucca Viaduct
1848
Lanesboro 41°57′51.3″N 75°35′0.6″W / 41.964250°N 75.583500°W / 41.964250; -75.583500 (Starrucca Viaduct )
Pennsylvania
United States
bridges
37
1974
Kansas City Park and Boulevard System
1893 to 1915
Kansas City 39°4′57″N 94°33′18″W / 39.08250°N 94.55500°W / 39.08250; -94.55500 (Kansas City Park and Boulevard System )
Missouri
United States
surveys & maps
38
1974
Milwaukee Metropolitan Sewage Treatment Plant , home of Milorganite [ 5]
1919
Milwaukee 43°1′21.3″N 87°53′57.3″W / 43.022583°N 87.899250°W / 43.022583; -87.899250 (Milwaukee Metropolitan Sewage Treatment Plant )
Wisconsin
United States
water supply & control
39
1974
Philadelphia Municipal Water Supply
1801
Philadelphia 39°57′56″N 75°10′51″W / 39.96556°N 75.18083°W / 39.96556; -75.18083 (Philadelphia Municipal Water Supply )
Pennsylvania
United States
water supply & control
40
1974
Stone Arch Bridge
1883
Minneapolis 44°58′50.8″N 93°15′12.3″W / 44.980778°N 93.253417°W / 44.980778; -93.253417 (Stone Arch Bridge )
Minnesota
United States
bridges
41
1975
Castillo de San Marcos
1695
St. Augustine 29°53′52″N 81°18′41″W / 29.89778°N 81.31139°W / 29.89778; -81.31139 (Castillo de San Marcos )
Florida
United States
buildings
42
1975
Croton Water Supply System
1842
New York City 41°0′42.5″N 73°52′36.4″W / 41.011806°N 73.876778°W / 41.011806; -73.876778 (Croton Water Supply System )
New York
United States
water supply & control
43
1975
Folsom Hydroelectric Power System
1895
Folsom 38°40′46.6″N 121°10′37.2″W / 38.679611°N 121.177000°W / 38.679611; -121.177000 (Folsom Hydroelectric Power System )
California
United States
power generation
44
1975
Granite Railway
1826
Quincy 42°14′44.6″N 71°2′9″W / 42.245722°N 71.03583°W / 42.245722; -71.03583 (Granite Railway )
Massachusetts
United States
roads & rails
45
1975
Hoosac Tunnel
1875
Berkshire County 42°40′31.1″N 73°2′45.1″W / 42.675306°N 73.045861°W / 42.675306; -73.045861 (Hoosac Tunnel )
Massachusetts
United States
tunnels
46
1975
Lawrence Experiment Station
1886
Lawrence 42°41′53.8″N 71°9′55.7″W / 42.698278°N 71.165472°W / 42.698278; -71.165472 (Lawrence Experiment Station )
Massachusetts
United States
research & educational
47
1975
Marlette Lake Water System
1873 to 1887
Virginia City 39°13′9.5″N 119°47′20.1″W / 39.219306°N 119.788917°W / 39.219306; -119.788917 (Marlette Lake Water System )
Nevada
United States
water supply & control
48
1975
Mount Washington Cog Railway
1869
Mount Washington 44°16′26″N 71°19′55″W / 44.27389°N 71.33194°W / 44.27389; -71.33194 (Mount Washington Cog Railway )
New Hampshire
United States
roads & rails
49
1975
Smithfield Street Bridge
1883
Pittsburgh 40°26′5.4″N 80°0′7.7″W / 40.434833°N 80.002139°W / 40.434833; -80.002139 (Smithfield Street Bridge )
Pennsylvania
United States
bridges
50
1975
Tunkhannock Viaduct
1915
Nicholson 41°37′34.2″N 75°46′34.4″W / 41.626167°N 75.776222°W / 41.626167; -75.776222 (Tunkhannock Viaduct )
Pennsylvania
United States
bridges
51
1976
Crozet's Blue Ridge Tunnel
1858
Waynesboro 38°2′3.1″N 78°51′28.4″W / 38.034194°N 78.857889°W / 38.034194; -78.857889 (Crozet's Blue Ridge Tunnel )
Virginia
United States
tunnels
52
1976
Cumbres and Toltec Scenic Railroad
1880
Chama to Antonito 36°59′42″N 106°17′51.1″W / 36.99500°N 106.297528°W / 36.99500; -106.297528 (Cumbres and Toltec Scenic Railroad )
New Mexico and Colorado
United States
roads & rails
53
1976
Elephant Butte Dam
1916
Truth or Consequences 33°9′14.9″N 107°11′31.3″W / 33.154139°N 107.192028°W / 33.154139; -107.192028 (Elephant Butte Dam )
New Mexico
United States
dams
54
1976
First Concrete Pavement
1893
Bellefontaine 40°21′37.5″N 83°45′33.6″W / 40.360417°N 83.759333°W / 40.360417; -83.759333 (First Concrete Pavement )
Ohio
United States
roads & rails
55
1976
International Boundary Marker No. 1 [ 6]
1855
Doña Ana County 31°47′2″N 106°31′47.1″W / 31.78389°N 106.529750°W / 31.78389; -106.529750 (International Boundary Marker No. 1 )
New Mexico
United States
surveys & maps
56
1976
King's Road
1766 to 1775
New Smyrna 29°38′23.4″N 81°16′50.3″W / 29.639833°N 81.280639°W / 29.639833; -81.280639 (King's Road )
Florida
United States
roads & rails
57
1976
National Road
1811–1839
Cumberland to Vandalia 39°57′38.7″N 82°27′2″W / 39.960750°N 82.45056°W / 39.960750; -82.45056 (National Road )
Maryland to Illinois
United States
roads & rails
58
1977
Charlestown Naval Dry Dock
1833
Boston 42°22′23.7″N 71°3′19.3″W / 42.373250°N 71.055361°W / 42.373250; -71.055361 (Charlestown Naval Dry Dock )
Massachusetts
United States
water transportation
59
1977
City Plan of Savannah
1733
Savannah 32°4′32″N 81°5′31″W / 32.07556°N 81.09194°W / 32.07556; -81.09194 (City Plan of Savannah )
Georgia
United States
surveys & maps
60
1977
Great Falls Raceway and Power System
1800
Paterson 40°54′55.1″N 74°10′52.1″W / 40.915306°N 74.181139°W / 40.915306; -74.181139 (Great Falls Raceway and Power System )
New Jersey
United States
power generation
61
1977
First New York Subway
1904
New York City 40°42′45.3″N 74°0′24.2″W / 40.712583°N 74.006722°W / 40.712583; -74.006722 (First New York Subway )
New York
United States
roads & rails
62
1977
Mason–Dixon line
1767
39°43′16.1″N 80°7′5.3″W / 39.721139°N 80.118139°W / 39.721139; -80.118139 (Mason–Dixon line )
Maryland & Pennsylvania
United States
surveys & maps
63
1977
Minot's Ledge Lighthouse
1860
off Scituate 42°16′11″N 70°45′32.9″W / 42.26972°N 70.759139°W / 42.26972; -70.759139 (Minot's Ledge Lighthouse )
Massachusetts
United States
water transportation
64
1977
Mullan Road
1862
Walla Walla 46°46′8.3″N 118°12′22.6″W / 46.768972°N 118.206278°W / 46.768972; -118.206278 (Mullan Road )
Washington
United States
roads & rails
65
1977
Dry Dock No 1 Norfolk Naval Shipyard
1833
Portsmouth 36°49′14″N 76°17′35″W / 36.82056°N 76.29306°W / 36.82056; -76.29306 (Gosport Naval Dry Docks )
Virginia
United States
water transportation
66
1977
Reversal of the Chicago River
1900
Chicago 41°42′18″N 87°56′2″W / 41.70500°N 87.93389°W / 41.70500; -87.93389 (Reversal of the Chicago River )
Illinois
United States
water transportation
67
1977
Vulcan Street Plant
1882
Appleton 44°15′29.2″N 88°23′50.2″W / 44.258111°N 88.397278°W / 44.258111; -88.397278 (Vulcan Street Plant )
Wisconsin
United States
power generation
68
1977
William E. Ward House
1876
Rye Brook 41°1′32.5″N 73°40′3.1″W / 41.025694°N 73.667528°W / 41.025694; -73.667528 (William E. Ward House )
New York
United States
buildings
69
1978
Boston Subway
1897
Boston 42°21′23.8″N 71°3′43.6″W / 42.356611°N 71.062111°W / 42.356611; -71.062111 (Boston Subway )
Massachusetts
United States
roads & rails
70
1978
Dunlap's Creek Bridge
1839
Brownsville 40°1′17.2″N 79°53′17.2″W / 40.021444°N 79.888111°W / 40.021444; -79.888111 (Dunlap's Creek Bridge )
Pennsylvania
United States
bridges
71
1978
Hudson and Manhattan Railroad Tunnel
1908
Jersey City to New York City 40°43′56.7″N 74°1′11.6″W / 40.732417°N 74.019889°W / 40.732417; -74.019889 (Hudson and Manhattan Railroad Tunnel )
New Jersey & New York
United States
tunnels
72
1978
Newark International Airport
1928
Newark 40°41′22.2″N 74°10′28.2″W / 40.689500°N 74.174500°W / 40.689500; -74.174500 (Newark International Airport )
New Jersey
United States
aviation
73
1978
United States Military Academy
1813
West Point 41°23′34.8″N 73°57′28.8″W / 41.393000°N 73.958000°W / 41.393000; -73.958000 (United States Military Academy )
New York
United States
research & educational
74
1979
Cleveland Hopkins Airport
1925
Cleveland 41°24′45″N 81°50′53″W / 41.41250°N 81.84806°W / 41.41250; -81.84806 (Cleveland Hopkins Airport )
Ohio
United States
aviation
75
1979
Fink Deck Truss Bridge
1870
Lynchburg 37°26′24.3″N 79°9′56″W / 37.440083°N 79.16556°W / 37.440083; -79.16556 (Fink Deck Truss Bridge )
Virginia
United States
bridges
76
1979
Fink Through Truss Bridge
1858
Hamden 40°36′14.3″N 74°54′8.1″W / 40.603972°N 74.902250°W / 40.603972; -74.902250 (Fink Through Truss Bridge )
New Jersey
United States
bridges
77
1979
Iron Bridge
1779
Ironbridge 52°37′38.4″N 2°29′7.6″W / 52.627333°N 2.485444°W / 52.627333; -2.485444 (Iron Bridge )
West Midlands
England
bridges
78
1979
Moffat Tunnel
1928
Winter Park 39°53′37.5″N 105°42′41.3″W / 39.893750°N 105.711472°W / 39.893750; -105.711472 (Moffat Tunnel )
Colorado
United States
tunnels
79
1979
Rockville Bridge
1902
Harrisburg 40°19′59.9″N 76°54′38.8″W / 40.333306°N 76.910778°W / 40.333306; -76.910778 (Rockville Bridge )
Pennsylvania
United States
bridges
80
1980
Goodyear Airdock
1929
Akron 41°1′54.9″N 81°28′14.6″W / 41.031917°N 81.470722°W / 41.031917; -81.470722 (Goodyear Airdock )
Ohio
United States
aviation
81
1980
Hydraulic-Inclined Plane System of the Morris Canal
1831
Waterloo Village 40°54′55.2″N 74°21′23.8″W / 40.915333°N 74.356611°W / 40.915333; -74.356611 (Hydraulic-Inclined Plane System of the Morris Canal )
New Jersey
United States
water transportation
82
1981
Borden Base Line
1831
Hatfield 42°25′33.7″N 72°37′9″W / 42.426028°N 72.61917°W / 42.426028; -72.61917 (Borden Base Line )
Massachusetts
United States
surveys & maps
83
1981
Chain of Rocks Water Purification Plant
1904
St. Louis 38°45′18.5″N 90°11′11.6″W / 38.755139°N 90.186556°W / 38.755139; -90.186556 (Chain of Rocks Water Purification Plant )
Missouri
United States
water supply & control
84
1981
Charles River Basin Project
1910
Boston 42°22′3.8″N 71°4′12.8″W / 42.367722°N 71.070222°W / 42.367722; -71.070222 (Charles River Basin Project )
Massachusetts
United States
water supply & control
85
1981
Cortland Street Drawbridge
1902
Chicago 41°55′1.1″N 87°39′51.4″W / 41.916972°N 87.664278°W / 41.916972; -87.664278 (Cortland Street Drawbridge )
Illinois
United States
bridges
86
1981
George Washington Bridge
1931
Fort Lee to New York City 40°51′6.1″N 73°57′9.7″W / 40.851694°N 73.952694°W / 40.851694; -73.952694 (George Washington Bridge )
New Jersey & New York
United States
bridges
87
1981
Louisville Water Works
1875 to 1896
Louisville 38°16′50″N 85°42′4.3″W / 38.28056°N 85.701194°W / 38.28056; -85.701194 (Louisville Water Works )
Kentucky
United States
water supply & control
88
1981
Montgomery Bell's Tunnel
1818
Cheatham County 36°8′48.5″N 87°7′19.3″W / 36.146806°N 87.122028°W / 36.146806; -87.122028 (Montgomery Bell's Tunnel )
Tennessee
United States
tunnels
89
1981
Snoqualmie Falls Cavity Generating Station
1899
Snoqualmie 47°32′39.5″N 121°50′29.3″W / 47.544306°N 121.841472°W / 47.544306; -121.841472 (Snoqualmie Falls Cavity Generating Station )
Washington
United States
power generation
90
1981
Union Station
1894
St. Louis 38°37′41.2″N 90°12′28.8″W / 38.628111°N 90.208000°W / 38.628111; -90.208000 (Union Station )
Missouri
United States
roads & rails
91
1981
Washington Monument
1885
Washington 38°53′22.1″N 77°2′6.9″W / 38.889472°N 77.035250°W / 38.889472; -77.035250 (Washington Monument )
District of Columbia
United States
buildings
92
1981
Whipple Truss Bridge
1855
Schenectady 42°49′5.2″N 73°55′27″W / 42.818111°N 73.92417°W / 42.818111; -73.92417 (Whipple Truss Bridge )
New York
United States
bridges
93
1982
Carrollton Viaduct
1829
Baltimore 39°16′31.5″N 76°39′18″W / 39.275417°N 76.65500°W / 39.275417; -76.65500 (Carrollton Viaduct )
Maryland
United States
bridges
94
1982
Detroit-Windsor Tunnel
1930
Detroit 42°19′28″N 83°2′25.4″W / 42.32444°N 83.040389°W / 42.32444; -83.040389 (Detroit-Windsor Tunnel )
Michigan
United States
tunnels
95
1982
Eads South Pass Navigation Works
1879
Port Eads 28°59′50″N 89°8′38″W / 28.99722°N 89.14389°W / 28.99722; -89.14389 (Eads South Pass Navigation Works )
Louisiana
United States
water transportation
96
1982
Holland Tunnel
1927
Jersey City to New York City 40°43′38.9″N 74°1′16″W / 40.727472°N 74.02111°W / 40.727472; -74.02111 (Holland Tunnel )
New Jersey & New York
United States
tunnels
97
1982
John A. Roebling Suspension Bridge
1866
Cincinnati 39°5′34.8″N 84°30′35.6″W / 39.093000°N 84.509889°W / 39.093000; -84.509889 (John A. Roebling Suspension Bridge )
Ohio
United States
bridges
98
1982
Kinzua Railway Viaduct
1882
McKean County 41°45′47.3″N 78°35′21.1″W / 41.763139°N 78.589194°W / 41.763139; -78.589194 (Kinzua Railway Viaduct )
Pennsylvania
United States
bridges
99
1982
Rogue River Bridge
1931
Gold Beach 42°25′40.5″N 124°24′47.5″W / 42.427917°N 124.413194°W / 42.427917; -124.413194 (Rogue River Bridge )
Oregon
United States
bridges
100
1982
Second Street Bridge
1886
Allegan 42°31′32.7″N 85°50′54.6″W / 42.525750°N 85.848500°W / 42.525750; -85.848500 (Second Street Bridge )
Michigan
United States
bridges
101
1982
Watertown Arsenal
1859
Watertown 42°21′44″N 71°9′58″W / 42.36222°N 71.16611°W / 42.36222; -71.16611 (Watertown Arsenal )
Massachusetts
United States
research & educational
102
1983
Atlantic City Convention Hall
1929
Atlantic City 39°21′18″N 74°26′19.1″W / 39.35500°N 74.438639°W / 39.35500; -74.438639 (Atlantic City Convention Hall )
New Jersey
United States
buildings
103
1983
Bailey Island Bridge
1928
Harpswell 43°44′57.1″N 69°59′19.3″W / 43.749194°N 69.988694°W / 43.749194; -69.988694 (Bailey Island Bridge )
Maine
United States
bridges
104
1983
Blenheim Bridge
1855
North Blenheim 42°28′18.4″N 74°26′29.4″W / 42.471778°N 74.441500°W / 42.471778; -74.441500 (Blenheim Bridge )
New York
United States
bridges
105
1983
Iron Building of the U.S. Army Arsenal
1859
Watervliet 42°43′5.9″N 73°42′14.5″W / 42.718306°N 73.704028°W / 42.718306; -73.704028 (Iron Building of the U.S. Army Arsenal )
New York
United States
buildings
106
1983
Ohio Canal System
1848
Akron 40°52′39.2″N 81°35′1.4″W / 40.877556°N 81.583722°W / 40.877556; -81.583722 (Ohio Canal System )
Ohio
United States
water transportation
107
1983
Peavey–Haglin Experimental Concrete Grain Elevator
1900
St. Louis Park 44°56′32.7″N 93°20′42.8″W / 44.942417°N 93.345222°W / 44.942417; -93.345222 (Peavey–Haglin Experimental Concrete Grain Elevator )
Minnesota
United States
buildings
108
1983
Sault Ste. Marie Hydroelectric Complex
1902
Sault Ste. Marie 46°29′50.8″N 84°19′55.7″W / 46.497444°N 84.332139°W / 46.497444; -84.332139 (Sault Ste. Marie Hydroelectric Complex )
Michigan
United States
power generation
109
1983
Zuiderzee Enclosure Dam
1927 to 1932
Zaandam 52°59′37.5″N 5°9′19.1″E / 52.993750°N 5.155306°E / 52.993750; 5.155306 (Zuiderzee Enclosure Dam )
North Holland
Netherlands
water supply & control
110
1984
Columbia River Scenic Highway
1922
Portland 45°39′19.3″N 121°54′13.2″W / 45.655361°N 121.903667°W / 45.655361; -121.903667 (Columbia River Scenic Highway )
Oregon
United States
roads & rails
111
1984
Columbia-Wrightsville Bridge
1930
Columbia 40°1′42.4″N 76°31′5.6″W / 40.028444°N 76.518222°W / 40.028444; -76.518222 (Columbia-Wrightsville Bridge )
Pennsylvania
United States
bridges
112
1984
Golden Gate Bridge
1937
San Francisco 37°49′11.7″N 122°28′42.7″W / 37.819917°N 122.478528°W / 37.819917; -122.478528 (Golden Gate Bridge )
California
United States
bridges
113
1984
Hoover Dam
1935
Boulder City 36°0′57.7″N 114°44′14.8″W / 36.016028°N 114.737444°W / 36.016028; -114.737444 (Hoover Dam )
Nevada & Arizona
United States
dams
114
1984
Lowell Waterpower System
1821
Lowell 42°38′48.5″N 71°18′41.6″W / 42.646806°N 71.311556°W / 42.646806; -71.311556 (Lowell Waterpower System )
Massachusetts
United States
power generation
115
1984
Panama Canal
1914
Colón to Panama City 9°7′2.2″N 79°43′7.6″W / 9.117278°N 79.718778°W / 9.117278; -79.718778 (Panama Canal )
Panama
water transportation
116
1984
Rocky River Pumped Storage Hydro-Plant
1925
New Milford 41°34′49.7″N 73°26′13.2″W / 41.580472°N 73.437000°W / 41.580472; -73.437000 (Rocky River Pumped Storage Hydro-Plant )
Connecticut
United States
power generation
117
1985
Bayonne Bridge
1931
Bayonne to Staten Island 40°38′29.8″N 74°8′31.6″W / 40.641611°N 74.142111°W / 40.641611; -74.142111 (Bayonne Bridge )
New Jersey & New York
United States
bridges
118
1985
Beginning Point of the U.S. Public Land Survey
1785
Liverpool 40°38′19.7″N 80°31′8.4″W / 40.638806°N 80.519000°W / 40.638806; -80.519000 (Beginning Point of the U.S. Public Land Survey )
Ohio
United States
surveys & maps
119
1985
Cape Cod Canal
1914
Barnstable County 41°45′51.1″N 70°34′6.3″W / 41.764194°N 70.568417°W / 41.764194; -70.568417 (Cape Cod Canal )
Massachusetts
United States
water transportation
120
1985
Chesapeake and Delaware Canal
1828 (rebuilt 1927)
New Castle 39°32′34″N 75°43′14″W / 39.54278°N 75.72056°W / 39.54278; -75.72056 (Chesapeake and Delaware Canal )
Delaware
United States
water transportation
121
1985
Davis Island Lock and Dam
1885
Pittsburgh 40°29′35″N 80°3′56″W / 40.49306°N 80.06556°W / 40.49306; -80.06556 (Davis Island Lock and Dam )
Pennsylvania
United States
water transportation
122
1985
Forth Railway Bridge
1890
North Queensferry to South Queensferry 56°0′1.5″N 3°23′19.4″W / 56.000417°N 3.388722°W / 56.000417; -3.388722 (Forth Railway Bridge )
Scotland
bridges
123
1985
Going-to-the-Sun Road
1932
Glacier National Park 48°41′42″N 113°49′1.2″W / 48.69500°N 113.817000°W / 48.69500; -113.817000 (Going-to-the-Sun Road )
Montana
United States
roads & rails
124
1985
High Bridge
1877
Jessamine & Mercer Counties37°49′1.7″N 84°43′12.4″W / 37.817139°N 84.720111°W / 37.817139; -84.720111 (High Bridge )
Kentucky
United States
bridges
125
1985
Statue of Liberty
1886
New York Harbor 40°41′21.5″N 74°2′40.4″W / 40.689306°N 74.044556°W / 40.689306; -74.044556 (Statue of Liberty )
New York [ 7]
United States
buildings
126
1986
White River Concrete Arch Bridge
1930
Cotter 36°16′2″N 92°32′39″W / 36.26722°N 92.54417°W / 36.26722; -92.54417 (White River Concrete Arch Bridge )
Arkansas
United States
bridges
127
1986
Cranetown Triangulation Site
1817
Cedar Grove 40°49′43.9″N 74°13′27.1″W / 40.828861°N 74.224194°W / 40.828861; -74.224194 (Cranetown Triangulation Site )
New Jersey
United States
surveys & maps
128
1986
Eiffel Tower
1889
Paris 48°51′30.2″N 2°17′40.2″E / 48.858389°N 2.294500°E / 48.858389; 2.294500 (Eiffel Tower )
Île-de-France
France
buildings
129
1986
El Camino Real
1598-1800s
Santa Fe and Mexico City 34°3′38.7″N 106°53′36.6″W / 34.060750°N 106.893500°W / 34.060750; -106.893500 (El Camino Real )
New Mexico
United States and Mexico
roads & rails
130
1986
El Camino Real (The Royal Road) Eastern Branch
from 16th century
San Antonio 29°26′45.8″N 98°30′12.3″W / 29.446056°N 98.503417°W / 29.446056; -98.503417 (El Camino Real (The Royal Road) Eastern Branch )
Texas
United States
roads & rails
131
1986
New Castle Ice Harbor
1974
New Castle 39°39′28″N 75°33′39″W / 39.65778°N 75.56083°W / 39.65778; -75.56083 (New Castle Ice Harbor )
Delaware
United States
water transportation
132
1986
Norris Dam
1936
Knoxville 36°13′28″N 84°5′31.5″W / 36.22444°N 84.092083°W / 36.22444; -84.092083 (Norris Dam )
Tennessee
United States
dams
133
1986
San Francisco–Oakland Bay Bridge
1937
San Francisco to Oakland 37°47′53.6″N 122°22′40.7″W / 37.798222°N 122.377972°W / 37.798222; -122.377972 (San Francisco–Oakland Bay Bridge )
California
United States
bridges
134
1986
Sewall's Bridge
1761 (rebuilt 1934)
York 43°8′10.2″N 70°39′38.3″W / 43.136167°N 70.660639°W / 43.136167; -70.660639 (Sewall's Bridge )
Maine
United States
bridges
135
1986
Triborough Bridge Project
1936
New York City 40°47′26.6″N 73°55′33.2″W / 40.790722°N 73.925889°W / 40.790722; -73.925889 (Triborough Bridge Project )
New York
United States
bridges
136
1986
U.S. Army Corps of Engineers Waterways Exp. Station
1929
Vicksburg 32°18′4.2″N 90°52′18″W / 32.301167°N 90.87167°W / 32.301167; -90.87167 (U.S. Army Corps of Engineers Waterways Exp. Station )
Mississippi
United States
research & educational
137
1986
U.S. Capitol
1793, rebuilt 1863
Washington 38°53′23″N 77°0′33″W / 38.88972°N 77.00917°W / 38.88972; -77.00917 (U.S. Capitol )
District of Columbia
United States
buildings
138
1987
Allegheny Portage Railroad
1834
Hollidaysburg 40°27′23″N 78°33′3.4″W / 40.45639°N 78.550944°W / 40.45639; -78.550944 (Allegheny Portage Railroad )
Pennsylvania
United States
roads & rails
139
1987
Bonneville Dam, Columbia River System
1937
Bonneville 45°38′39.7″N 121°56′26.7″W / 45.644361°N 121.940750°W / 45.644361; -121.940750 (Bonneville Dam, Columbia River System )
Oregon
United States
power generation
140
1987
Bridges of Keeseville
1843, 1878, 1888
Keeseville 44°30′13.2″N 73°28′57.3″W / 44.503667°N 73.482583°W / 44.503667; -73.482583 (Bridges of Keeseville )
New York
United States
bridges
141
1987
Dismal Swamp Canal
1805
Chesapeake to South Mills 36°35′34.1″N 76°23′5.4″W / 36.592806°N 76.384833°W / 36.592806; -76.384833 (Dismal Swamp Canal )
Virginia to North Carolina
United States
water transportation
142
1987
Houston Ship Channel
1837–present
Houston 29°44′35.8″N 95°6′16.5″W / 29.743278°N 95.104583°W / 29.743278; -95.104583 (Houston Ship Channel )
Texas
United States
water transportation
143
1987
Kamehameha V Post Office
1871
Honolulu 21°18′34.6″N 157°51′47.4″W / 21.309611°N 157.863167°W / 21.309611; -157.863167 (Kamehameha V Post Office )
Hawaii
United States
buildings
144
1987
Frisco Bridge
1892
Memphis 35°7′43.6″N 90°4′34.7″W / 35.128778°N 90.076306°W / 35.128778; -90.076306 (Frisco Bridge )
Tennessee & Arkansas
United States
bridges
145
1987
Quebec Bridge
1917
Quebec City 46°44′45.6″N 71°17′17.3″W / 46.746000°N 71.288139°W / 46.746000; -71.288139 (Quebec Bridge )
Quebec
Canada
bridges
146
1988
Belle Fourche Dam
1911
Belle Fourche 44°43′51.3″N 103°40′36.8″W / 44.730917°N 103.676889°W / 44.730917; -103.676889 (Belle Fourche Dam )
South Dakota
United States
dams
147
1988
École Nationale des Ponts et Chaussées
1747
Paris 48°51′20.9″N 2°19′49.9″E / 48.855806°N 2.330528°E / 48.855806; 2.330528 (École Nationale des Ponts et Chaussées )
Île-de-France
France
research & educational
148
1988
Keokuk Hydro-Power System
1913
Keokuk 40°23′56.6″N 91°21′49″W / 40.399056°N 91.36361°W / 40.399056; -91.36361 (Keokuk Hydro-Power System )
Iowa
United States
power generation
149
1988
Pennsylvania Turnpike
1940
40°1′49.9″N 78°29′33.6″W / 40.030528°N 78.492667°W / 40.030528; -78.492667 (Pennsylvania Turnpike )
Pennsylvania
United States
roads & rails
150
1988
River des Peres Sewerage & Drainage Works
1924 to 1931
St. Louis 38°39′42.3″N 90°18′33.9″W / 38.661750°N 90.309417°W / 38.661750; -90.309417 (River des Peres Sewerage & Drainage Works )
Missouri
United States
water supply & control
151
1988
Sydney Harbour Bridge
1932
Sydney 33°51′8.1″S 151°12′38.6″E / 33.852250°S 151.210722°E / -33.852250; 151.210722 (Sydney Harbour Bridge )
New South Wales
Australia
bridges
152
1989
Royal Colonial Boundary of 1665
1728–1819
Middlesboro 36°36′2.9″N 83°40′31.5″W / 36.600806°N 83.675417°W / 36.600806; -83.675417 (Royal Colonial Boundary of 1665 )
Kentucky
United States
surveys & maps
153
1989
Zhaozhou Bridge
605 AD
Zhaoxian 37°43′12.9″N 114°45′47.7″E / 37.720250°N 114.763250°E / 37.720250; 114.763250 (Zhaozhou Bridge )
Hebei
China
bridges
154
1990
Fort Peck Dam
1940
Fort Peck 48°0′10.1″N 106°24′58″W / 48.002806°N 106.41611°W / 48.002806; -106.41611 (Fort Peck Dam )
Montana
United States
dams
155
1990
Maria Pia Bridge
1877
Oporto 41°8′23.4″N 8°35′49.6″W / 41.139833°N 8.597111°W / 41.139833; -8.597111 (Maria Pia Bridge )
Norte
Portugal
bridges
156
1990
Salginatobel Bridge
1930
Grisons 46°58′54.4″N 9°43′5.1″E / 46.981778°N 9.718083°E / 46.981778; 9.718083 (Salginatobel Bridge )
Graubünden
Switzerland
bridges
157
1991
Eddystone Lighthouse
1882
off Plymouth 50°11′2″N 4°16′5.1″W / 50.18389°N 4.268083°W / 50.18389; -4.268083 (Eddystone Lighthouse )
England
water transportation
158
1991
Fritz Engineering Laboratory
1910
Bethlehem 40°36′28.9″N 75°22′34.3″W / 40.608028°N 75.376194°W / 40.608028; -75.376194 (Fritz Engineering Laboratory )
Pennsylvania
United States
research & educational
159
1991
St. Clair Tunnel
1891
Port Huron 42°57′32.4″N 82°25′22.2″W / 42.959000°N 82.422833°W / 42.959000; -82.422833 (St. Clair Tunnel )
Michigan
United States
tunnels
160
1991
Thames Tunnel
1843
London 51°30′12.7″N 0°3′13.3″W / 51.503528°N 0.053694°W / 51.503528; -0.053694 (Thames Tunnel )
England
tunnels
161
1992
Acquedotto Traiano-Paolo
110 AD
Rome 42°3′12.9″N 12°20′18.7″E / 42.053583°N 12.338528°E / 42.053583; 12.338528 (Acquedotto Traiano-Paolo )
Lazio
Italy
water supply & control
162
1992
Niagara Falls Suspension Bridge
1849, 1855, 1883, 1898, 1941
Niagara Gorge 43°5′24.8″N 79°4′3.4″W / 43.090222°N 79.067611°W / 43.090222; -79.067611 (Niagara Falls Suspension Bridge )
Ontario and New York
Canada and United States
bridges
163
1992
Duck Creek Aqueduct
1846
Metamora 39°26′46.1″N 85°7′48″W / 39.446139°N 85.13000°W / 39.446139; -85.13000 (Duck Creek Aqueduct )
Indiana
United States
water supply & control
164
1992
Hohokam Canal System
600 - 1450 AD
Maricopa County 33°26′43.8″N 111°48′56.2″W / 33.445500°N 111.815611°W / 33.445500; -111.815611 (Hohokam Canal System )
Arizona
United States
water supply & control
165
1992
San Jacinto Monument
1939
Houston 29°44′59.5″N 95°4′50.6″W / 29.749861°N 95.080722°W / 29.749861; -95.080722 (San Jacinto Monument )
Texas
United States
buildings
166
1993
Blimp Hangars
1942
Tustin 33°42′10.8″N 117°49′26.3″W / 33.703000°N 117.823972°W / 33.703000; -117.823972 (Blimp Hangars )
California
United States
aviation
167
1993
Denison Dam
1943
Denison 33°49′52.6″N 96°34′16″W / 33.831278°N 96.57111°W / 33.831278; -96.57111 (Denison Dam )
Texas & Oklahoma
United States
dams
168
1993
Hanford B Reactor
1944
Richland 46°37′49.1″N 119°38′50.3″W / 46.630306°N 119.647306°W / 46.630306; -119.647306 (Hanford B Reactor )
Washington
United States
power generation
169
1993
Stevens Pass Railroad Tunnels & Switchback System
1900
Stevens Pass 47°44′52.4″N 121°7′26.3″W / 47.747889°N 121.123972°W / 47.747889; -121.123972 (Stevens Pass Railroad Tunnels & Switchback System )
Washington
United States
tunnels
170
1994
Colorado River Aqueduct
1933–1941
Blythe 34°17′23.6″N 114°10′19.5″W / 34.289889°N 114.172083°W / 34.289889; -114.172083 (Colorado River Aqueduct )
California
United States
water supply & control
171
1994
Kavanagh Building
1936
Buenos Aires 34°35′43.7″S 58°22′28.9″W / 34.595472°S 58.374694°W / -34.595472; -58.374694 (Kavanagh Building )
Argentina
buildings
172
1994
Missouri River Bridges
1926
Chamberlain 43°48′42.1″N 99°20′16.1″W / 43.811694°N 99.337806°W / 43.811694; -99.337806 (Missouri River Bridges )
South Dakota
United States
bridges
173
1995
Red Hill Underground Fuel Storage Facility
1943
Honolulu 21°22′18″N 157°53′44″W / 21.37167°N 157.89556°W / 21.37167; -157.89556 (Red Hill Underground Fuel Storage Facility )
Hawaii
United States
tunnels
174
1994
Viaducto del Malleco
1890
Malleco River 37°57′47″S 72°26′20″W / 37.96306°S 72.43889°W / -37.96306; -72.43889 (Viaducto del Malleco )
Central Chile
Chile
bridges
175
1994
White Pass and Yukon Route
1900
Whitehorse, Yukon to Skagway, Alaska 59°37′28″N 135°8′18.3″W / 59.62444°N 135.138417°W / 59.62444; -135.138417 (White Pass and Yukon Route )
Yukon Territory to Alaska
Canada & United States
roads & rails
176
1995
Alaska Highway
1942
Dawson Creek to Delta Junction 59°54′39.6″N 131°33′20.6″W / 59.911000°N 131.555722°W / 59.911000; -131.555722 (Alaska Highway )
British Columbia to Alaska
Canada & United States
roads & rails
177
1995
Banaue Rice Terraces
100 BC
Banaue 16°55′57.4″N 121°3′30.1″E / 16.932611°N 121.058361°E / 16.932611; 121.058361 (Banaue Rice Terraces )
Ifugao
Philippines
water supply & control
178
1995
Acueducto de Queretaro
1738
Querétaro 20°35′48″N 100°22′20.6″W / 20.59667°N 100.372389°W / 20.59667; -100.372389 (Acueducto de Queretaro )
Mexico
water supply & control
179
1995
Victoria Falls Bridge
1905
Zambezi River 17°55′41.7″S 25°51′26.1″E / 17.928250°S 25.857250°E / -17.928250; 25.857250 (Victoria Falls Bridge )
Zimbabwe & Zambia
bridges
180
1996
Armour-Swift-Burlington Bridge
1912
Kansas City 39°7′0″N 94°34′47.5″W / 39.11667°N 94.579861°W / 39.11667; -94.579861 (Armour-Swift-Burlington Bridge )
Missouri
United States
bridges
181
1996
Dublin-Belfast railway line
1839
Dublin to Belfast 53°43′0″N 6°20′15″W / 53.71667°N 6.33750°W / 53.71667; -6.33750 (Dublin-Belfast railway line )
Ireland & Northern Ireland
roads & rails
182
1996
Kentucky Dam
1944
Gilbertsville 37°0′46.4″N 88°16′10.1″W / 37.012889°N 88.269472°W / 37.012889; -88.269472 (Kentucky Dam )
Kentucky
United States
dams
183
1996
Lake Moeris Quarry Road
2575-2137 BC
Lake Moeris 29°37′24.2″N 30°38′40.4″E / 29.623389°N 30.644556°E / 29.623389; 30.644556 (Lake Moeris Quarry Road )
Egypt
roads & rails
184
1996
City Plan of Philadelphia
1682
Philadelphia 39°57′28.6″N 75°10′14.2″W / 39.957944°N 75.170611°W / 39.957944; -75.170611 (City Plan of Philadelphia )
Pennsylvania
United States
surveys & maps
185
1996
San Antonio River Walk & Flood Control System
1929 to 1941
San Antonio 29°25′30.7″N 98°29′29.7″W / 29.425194°N 98.491583°W / 29.425194; -98.491583 (San Antonio River Walk & Flood Control System )
Texas
United States
water control & supply
186
1997
Grand Coulee Dam
1941
Grand Coulee 47°57′23.8″N 118°58′51.6″W / 47.956611°N 118.981000°W / 47.956611; -118.981000 (Grand Coulee Dam )
Washington
United States
dams
187
1997
Lake Washington Ship Canal & Hiram M. Chittenden Locks
1917
Seattle 47°39′55.7″N 122°23′49.6″W / 47.665472°N 122.397111°W / 47.665472; -122.397111 (Lake Washington Ship Canal & Hiram M. Chittenden Locks )
Washington
United States
water transportation
188
1997
Navajo Bridge
1929
Page 36°49′3.4″N 111°37′52.3″W / 36.817611°N 111.631194°W / 36.817611; -111.631194 (Navajo Bridge )
Arizona
United States
bridges
189
1997
North Island Main Trunk Railway
1885–1908
Auckland to Wellington 39°13′39.8″S 175°23′55.5″E / 39.227722°S 175.398750°E / -39.227722; 175.398750 (North Island Main Trunk Railway )
North Island
New Zealand
roads & rails
190
1997
Northampton Street Bridge
1896
Easton to Phillipsburg 40°41′29.3″N 75°12′14.4″W / 40.691472°N 75.204000°W / 40.691472; -75.204000 (Northampton Street Bridge )
Pennsylvania & New Jersey
United States
bridges
191
1997
Snowy Mountains Scheme
1974
Snowy Mountains 35°36′40.1″S 148°17′29.8″E / 35.611139°S 148.291611°E / -35.611139; 148.291611 (Snowy Mountains Scheme )
New South Wales
Australia
power generation
192
1997
Texas Commerce Bank Building (formerly Gulf, now Chase)
1929
Houston 29°45′32″N 95°21′49.7″W / 29.75889°N 95.363806°W / 29.75889; -95.363806 (Texas Commerce Bank Building (formerly Gulf, now Chase) )
Texas
United States
buildings
193
1997
Walnut Street Bridge
1890
Harrisburg 40°15′27.1″N 76°53′9.8″W / 40.257528°N 76.886056°W / 40.257528; -76.886056 (Walnut Street Bridge )
Pennsylvania
United States
bridges
194
1998
Brooks AFB, Old Hangar 9
1918
San Antonio 29°20′38.5″N 98°26′38.9″W / 29.344028°N 98.444139°W / 29.344028; -98.444139 (Brooks AFB, Old Hangar 9 )
Texas
United States
aviation
195
1998
Canton Viaduct
1835
Canton 42°9′28.8″N 71°9′14.5″W / 42.158000°N 71.154028°W / 42.158000; -71.154028 (Canton Viaduct )
Massachusetts
United States
bridges
196
1998
Göta Canal
1810 to 1832
Gothenburg 58°29′53.9″N 16°10′28.9″E / 58.498306°N 16.174694°E / 58.498306; 16.174694 (Göta Canal )
Västra Götaland
Sweden
water transportation
197
1998
Moseley Wrought Iron Arch Bridge
1864
North Andover 42°40′8.6″N 71°7′21.3″W / 42.669056°N 71.122583°W / 42.669056; -71.122583 (Moseley Wrought Iron Arch Bridge )
Massachusetts
United States
bridges
198
1998
Tehachapi Pass Railroad Line
1876
Kern County 35°12′3″N 118°32′13″W / 35.20083°N 118.53694°W / 35.20083; -118.53694 (Tehachapi Pass Railroad Line )
California
United States
roads & rails
199
1999
Acueducto de Segovia
50 AD
Segovia 40°56′52.7″N 4°7′4.3″W / 40.947972°N 4.117861°W / 40.947972; -4.117861 (Acueducto de Segovia )
Castile and León
Spain
water supply & control
200
1999
Arroyo Seco Parkway
1940
Los Angeles 34°4′23″N 118°14′2″W / 34.07306°N 118.23389°W / 34.07306; -118.23389 (Arroyo Seco Parkway )
California
United States
roads & rails
201
1999
Blue Ridge Parkway
begun 1935
Shenandoah NP to Great Smokey Mountains NP 36°26′28.5″N 81°5′42.9″W / 36.441250°N 81.095250°W / 36.441250; -81.095250 (Blue Ridge Parkway )
Virginia to North Carolina
United States
roads & rails
202
1999
Cape Hatteras Lighthouse
1870
Cape Hatteras 35°15′2″N 75°31′43.7″W / 35.25056°N 75.528806°W / 35.25056; -75.528806 (Cape Hatteras Lighthouse )
North Carolina
United States
water transportation
203
1999
Maine Turnpike
1947
43°21′17.2″N 70°35′26.2″W / 43.354778°N 70.590611°W / 43.354778; -70.590611 (Maine Turnpike )
Maine
United States
roads & rails
204
1999
McNeill Street Pumping Station
1887
Shreveport 32°31′3.8″N 93°45′25.9″W / 32.517722°N 93.757194°W / 32.517722; -93.757194 (McNeill Street Pumping Station )
Louisiana
United States
water supply & control
205
2000
Cedar Falls Hydroelectric Project
1901
Seattle 47°25′9.2″N 121°46′54.4″W / 47.419222°N 121.781778°W / 47.419222; -121.781778 (Cedar Falls Hydroelectric Project )
Washington
United States
power generation
206
2000
Forth and Clyde Canal and Union Canal
1790
55°56′18″N 4°9′18.8″W / 55.93833°N 4.155222°W / 55.93833; -4.155222 (Forth and Clyde Canal and Union Canal )
Scotland
water transportation
207
2000
Hagia Sophia
537 AD
Istanbul 41°0′31.2″N 28°58′48.6″E / 41.008667°N 28.980167°E / 41.008667; 28.980167 (Hagia Sophia )
Istanbul
Turkey
buildings
208
2000
Muskingum River Navigation System
1837
Zanesville 39°43′59.5″N 81°54′29.4″W / 39.733194°N 81.908167°W / 39.733194; -81.908167 (Muskingum River Navigation System )
Ohio
United States
water transportation
209
2000
Seventh Street Improvement Arches
1909
St. Paul 44°57′23″N 93°4′38″W / 44.95639°N 93.07722°W / 44.95639; -93.07722 (Seventh Street Improvement Arches )
Minnesota
United States
bridges
210
2000
West Baden Springs Hotel
1902
West Baden Springs 38°34′1.3″N 86°37′6.6″W / 38.567028°N 86.618500°W / 38.567028; -86.618500 (West Baden Springs Hotel )
Indiana
United States
buildings
211
2001
Bunker Hill Covered Bridge
1895, rebuilt 1994
Claremont 35°43′17.5″N 81°6′54.8″W / 35.721528°N 81.115222°W / 35.721528; -81.115222 (Bunker Hill Covered Bridge )
North Carolina
United States
bridges
212
2001
Galveston Seawall and Grade Raising
1904 (expanded through 1963)
Galveston 29°18′9″N 94°46′27″W / 29.30250°N 94.77417°W / 29.30250; -94.77417 (Galveston Seawall and Grade Raising )
Texas
United States
water supply & control
213
2001
Baltimore & Ohio Roundhouse & Shop Complex
1842 to 1850s
Martinsburg 39°27′33″N 77°57′36″W / 39.45917°N 77.96000°W / 39.45917; -77.96000 (Baltimore & Ohio Roundhouse & Shop Complex )
West Virginia
United States
buildings
214
2002
Conwy Suspension Bridge
1826
Conwy 53°16′49.7″N 3°49′25.6″W / 53.280472°N 3.823778°W / 53.280472; -3.823778 (Conwy Suspension Bridge )
Conwy
Wales
bridges
215
2002
Conwy Tubular Bridge
1849
Conwy 53°16′49″N 3°49′25″W / 53.28028°N 3.82361°W / 53.28028; -3.82361 (Conwy Tubular Bridge )
Conwy
Wales
bridges
216
2002
Dorton Arena
1952
Raleigh 35°47′38.4″N 78°42′37.3″W / 35.794000°N 78.710361°W / 35.794000; -78.710361 (Dorton Arena )
North Carolina
United States
buildings
217
2002
East Maui Irrigation System
1876 to 1923
East Maui 20°52′0″N 156°13′0″W / 20.86667°N 156.21667°W / 20.86667; -156.21667 (East Maui Irrigation System )
Hawaii
United States
water supply & control
218
2002
Five Stone Arch Bridges
1830 to 1866
Hillsborough 43°7′49″N 71°56′41.1″W / 43.13028°N 71.944750°W / 43.13028; -71.944750 (Five Stone Arch Bridges )
New Hampshire
United States
bridges
219
2002
Louisville and Portland Canal Locks & Dam
1830, rebuilt 1962
Louisville 38°16′18.5″N 85°46′45.6″W / 38.271806°N 85.779333°W / 38.271806; -85.779333 (Louisville and Portland Canal Locks & Dam )
Kentucky
United States
water transportation
220
2002
Marshall Building
1906
Milwaukee 43°2′0.9″N 87°54′31.2″W / 43.033583°N 87.908667°W / 43.033583; -87.908667 (Marshall Building )
Wisconsin
United States
buildings
221
2002
Menai Suspension Bridge
1826
Anglesey 53°13′13.1″N 4°9′48.1″W / 53.220306°N 4.163361°W / 53.220306; -4.163361 (Menai Suspension Bridge )
Wales
bridges
222
2002
Old Cape Henry Light ,
1792, replaced 1881
Virginia Beach 36°55′32.8″N 76°0′29.3″W / 36.925778°N 76.008139°W / 36.925778; -76.008139 (Old Cape Henry Light )
Virginia
United States
water transportation
223
2002
Portland Head Light
1787
Cape Elizabeth 43°37′23.2″N 70°12′28.4″W / 43.623111°N 70.207889°W / 43.623111; -70.207889 (Portland Head Light )
Maine
United States
water transportation
224
2002
Shannon Hydroelectric Scheme
1929
52°42′20″N 8°36′46″W / 52.70556°N 8.61278°W / 52.70556; -8.61278 (Shannon Hydroelectric Scheme )
Ireland
power generation
225
2002
Waldo-Hancock Suspension Bridge
1931
Bucksport 44°33′37.6″N 68°48′5.9″W / 44.560444°N 68.801639°W / 44.560444; -68.801639 (Waldo-Hancock Suspension Bridge )
Maine
United States
bridges
226
2003
Horseshoe Curve
1854
Altoona 40°29′54″N 78°29′9.1″W / 40.49833°N 78.485861°W / 40.49833; -78.485861 (Horseshoe Curve )
Pennsylvania
United States
roads & rails
227
2003
Suez Canal
1869
Port Said to Suez 30°42′18″N 32°20′39″E / 30.70500°N 32.34417°E / 30.70500; 32.34417 (Suez Canal )
Egypt
water transportation
228
2003
Tennessee State Capitol
1845 to 1877
Nashville 36°9′57.1″N 86°47′3.4″W / 36.165861°N 86.784278°W / 36.165861; -86.784278 (Tennessee State Capitol )
Tennessee
United States
buildings
229
2004
Hwaseong Fortress
1796
Suwon 37°17′0″N 127°0′57.6″E / 37.28333°N 127.016000°E / 37.28333; 127.016000 (Hwaseong Fortress )
Gyeonggi-do
Republic of Korea
buildings
230
2004
Mesa Verde Reservoirs
750 to 1180 AD
Montezuma County 37°14′26.3″N 108°30′16.7″W / 37.240639°N 108.504639°W / 37.240639; -108.504639 (Mesa Verde Reservoirs )
Colorado
United States
water supply & control
231
2004
Northern Pacific High Line Bridge No 64
1908
Valley City 46°56′18.9″N 97°59′26.9″W / 46.938583°N 97.990806°W / 46.938583; -97.990806 (Northern Pacific High Line Bridge No 64 )
North Dakota
United States
bridges
232
2004
Old Wisla Bridge
Tczew 54°5′33.7″N 18°48′22.2″E / 54.092694°N 18.806167°E / 54.092694; 18.806167 (Old Wisla Bridge )
Vistula River
Poland
bridges
233
2005
Great Western Railway
1838
51°37′16.2″N 1°21′26.8″W / 51.621167°N 1.357444°W / 51.621167; -1.357444 (Great Western Railway )
England & Wales
roads & rails
234
2005
Philadelphia City Hall
1901
Philadelphia 39°57′10.1″N 75°9′48.8″W / 39.952806°N 75.163556°W / 39.952806; -75.163556 (Philadelphia City Hall )
Pennsylvania
United States
buildings
235
2005
Sweetwater Dam
1888
Spring Valley 32°41′29.8″N 117°0′29.2″W / 32.691611°N 117.008111°W / 32.691611; -117.008111 (Sweetwater Dam )
California
United States
dams
236
2005
Stanley Hydraulics Laboratory at the University of Iowa
established 1919
Iowa City 41°39′25.8″N 91°32′29″W / 41.657167°N 91.54139°W / 41.657167; -91.54139 (Stanley Hydraulics Laboratory at the University of Iowa )
Iowa
United States
research & educational
237
2006
Machu Picchu
1460 AD
13°9′48″S 72°32′44″W / 13.16333°S 72.54556°W / -13.16333; -72.54556 (Machu Picchu )
Peru
urban development
238
2006
Portland Observatory
1807
Portland 43°39′55.4″N 70°14′53.7″W / 43.665389°N 70.248250°W / 43.665389; -70.248250 (Portland Observatory )
Maine
United States
water transportation
239
2006
Tipon
1200 - 1534 AD
13°34′15″S 71°46′59″W / 13.57083°S 71.78306°W / -13.57083; -71.78306 (Tipon )
Peru
water supply & control
240
2007
Caledonian Canal
1822
Great Glen 57°6′44.9″N 4°44′18.8″W / 57.112472°N 4.738556°W / 57.112472; -4.738556 (Caledonian Canal )
Scotland
water transportation
241
2007
Craigellachie Bridge Moray
1814
Strathspey 57°29′28.8″N 3°11′38″W / 57.491333°N 3.19389°W / 57.491333; -3.19389 (Craigellachie Bridge Moray )
Scotland
bridges
242
2008
Choate Bridge
1764
Ipswich 42°40′46.1″N 70°50′13.6″W / 42.679472°N 70.837111°W / 42.679472; -70.837111 (Choate Bridge )
Massachusetts
United States
bridges
243
2008
Goldfields Water Supply
1903
Kalgoorlie 31°57′36″S 116°10′16.7″E / 31.96000°S 116.171306°E / -31.96000; 116.171306 (Goldfields Water Supply )
Western Australia
Australia
water supply & control
244
2008
Lacey V. Murrow Bridge and Mount Baker Ridge Tunnels
1940
King County 47°35′23.2″N 122°16′44.3″W / 47.589778°N 122.278972°W / 47.589778; -122.278972 (Lacey V. Murrow Bridge and Mount Baker Ridge Tunnels )
Washington
United States
bridges
245
2008
Woodhead Dam
1897
Cape Town 33°58′38.2″S 18°24′7.9″E / 33.977278°S 18.402194°E / -33.977278; 18.402194 (Woodhead Dam )
Western Cape
South Africa
dams
246
2009
Guayabo Ceremonial Center
300 BC - AD 1400
Turrialba9°58′21.7″N 83°41′26.6″W / 9.972694°N 83.690722°W / 9.972694; -83.690722 (Guayabo Ceremonial Center )
Turrialba
Costa Rica
civil engineering profession
247
2009
Vancouver's Mapping of the West Coast of North America
1791–1795
45°0′0″N 124°0′43″W / 45.00000°N 124.01194°W / 45.00000; -124.01194 (Vancouver's Mapping of the West Coast of North America )
Canada , Mexico and United States
surveys & maps
248
2009
Poughkeepsie-Highland Bridge
1886–1888
Poughkeepsie 41°42′38.5″N 73°56′41.1″W / 41.710694°N 73.944750°W / 41.710694; -73.944750 (Poughkeepsie-Highland Bridge )
New York
United States
bridges
249
2009
Manhattan Bridge
1909
New York City 40°42′27″N 73°59′26.9″W / 40.70750°N 73.990806°W / 40.70750; -73.990806 (Manhattan Bridge )
New York
United States
bridges
250
2009
Queensboro Bridge
1909
New York City 40°45′24.2″N 73°57′15.1″W / 40.756722°N 73.954194°W / 40.756722; -73.954194 (Queensboro Bridge )
New York
United States
bridges
251
2009
Williamsburg Bridge
1903
New York City 40°42′49.2″N 73°58′20.5″W / 40.713667°N 73.972361°W / 40.713667; -73.972361 (Williamsburg Bridge )
New York
United States
bridges
252
2010
Mackinac Bridge
1958
Straits of Mackinac 45°48′48.8″N 84°43′42″W / 45.813556°N 84.72833°W / 45.813556; -84.72833 (Mackinac Bridge )
Michigan
United States
bridges
253
2010
Rensselaer Polytechnic Institute
1824
Troy 42°43′48″N 73°40′39″W / 42.73000°N 73.67750°W / 42.73000; -73.67750 (Rensselaer Polytechnic Institute )
New York
United States
research & educational
254
2010
Thomas Viaduct Railroad Bridge [ 8]
1835
Elkridge and Relay 39°13′17.5″N 76°42′48.1″W / 39.221528°N 76.713361°W / 39.221528; -76.713361 (Thomas Viaduct Railroad Bridge )
Maryland
United States
bridges
255
2011
Utica Memorial Auditorium
1959
Utica 43°6′17.9″N 75°14′0.5″W / 43.104972°N 75.233472°W / 43.104972; -75.233472 (Utica Memorial Auditorium )
New York
United States
buildings
256
2011
Tacoma Narrows Bridges [ 9]
1940-1950
Tacoma 47°16′8″N 122°33′3″W / 47.26889°N 122.55083°W / 47.26889; -122.55083 (Tacoma Narrows Bridges )
Washington
United States
bridges
257
2011
Flight of Five Locks
1915
Waterford 42°48′2.8″N 73°41′29.1″W / 42.800778°N 73.691417°W / 42.800778; -73.691417 (Flight of Five Locks )
New York
United States
water transportation
258
2011
Petra
309 BC
30°19′43″N 35°26′31″E / 30.32861°N 35.44194°E / 30.32861; 35.44194 (Petra )
Ma'an Governorate
Jordan
buildings
259
2012
Zion-Mount Carmel Tunnel and Highway
1930
Zion National Park 37°12′40.7″N 112°57′29.6″W / 37.211306°N 112.958222°W / 37.211306; -112.958222 (Zion-Mount Carmel Tunnel and Highway )
Utah
United States
roads & rails
260
2012
Huey P. Long Bridge
1935
Jefferson Parish 29°56′38.8″N 90°10′7.6″W / 29.944111°N 90.168778°W / 29.944111; -90.168778 (Huey P. Long Bridge )
Louisiana
United States
bridges
261
2012
Grand Central Terminal
1913
New York City 40°45′10.3″N 73°58′37.9″W / 40.752861°N 73.977194°W / 40.752861; -73.977194 (Grand Central Terminal )
New York
United States
roads & rails
262
2013
Titan Clydebank crane
1907
Clydebank 55°53′50.5″N 4°24′31.2″W / 55.897361°N 4.408667°W / 55.897361; -4.408667 (Titan Clydebank crane )
West Dunbartonshire
Scotland
buildings
263
2013
Waterford Bridges
1909
Troy and Waterford 42°47′19.3″N 73°40′25.8″W / 42.788694°N 73.673833°W / 42.788694; -73.673833 (Waterford Bridges )
New York
United States
bridges
264
2013
Lake Pontchartrain Causeway
1956
Lake Pontchartrain 30°11′59.2″N 90°7′21.7″W / 30.199778°N 90.122694°W / 30.199778; -90.122694 (Lake Pontchartrain Causeway )
Louisiana
United States
bridges
265
2014
The Dalles Dam
1957
Columbia River 45°36′50.3″N 121°8′3″W / 45.613972°N 121.13417°W / 45.613972; -121.13417 (The Dalles Dam )
Oregon & Washington
United States
dams
266
2015
Gladesville Bridge
1964
Sydney 33°50′31.3″S 151°8′51.8″E / 33.842028°S 151.147722°E / -33.842028; 151.147722 (Gladesville Bridge )
New South Wales
Australia
bridges
267
2016
Cape Agulhas Lighthouse
1848
L'Agulhas 34°49′45.7″S 20°0′32.4″E / 34.829361°S 20.009000°E / -34.829361; 20.009000 (Cape Agulhas Lighthouse )
South Africa
water transportation
268
2016
Arrowrock Dam
1912
Boise and Elmore 43°35′43″N 115°55′21.1″W / 43.59528°N 115.922528°W / 43.59528; -115.922528 (Arrowrock Dam )
Idaho
United States
dams
269
2016
All-American Canal [ 10]
1940
Imperial County 32°52′59″N 114°27′54″W / 32.88306°N 114.46500°W / 32.88306; -114.46500 (All-American Canal )
California
United States
water supply & control
270
2016
Canal du Midi [ 11]
1681
Toulouse to Étang de Thau 43°12′52.9″N 2°25′49.8″E / 43.214694°N 2.430500°E / 43.214694; 2.430500 (Canal du Midi )
Occitania
France
water transportation
271
2016
Liverpool and Manchester Railway [ 12]
1830
Liverpool to Manchester 53°27′10.8″N 2°36′58.6″W / 53.453000°N 2.616278°W / 53.453000; -2.616278 (Liverpool & Manchester Railway )
North West England
England
roads & rails
272
2017
Bonnet Carré Spillway
1931
St. Charles Parish 30°0′7.2″N 90°26′23.3″W / 30.002000°N 90.439806°W / 30.002000; -90.439806 (Bonnet Carré Spillway )
Louisiana
United States
dams
273
2017
Duluth Aerial Ferry/Lift Bridge [ 13]
1905
Duluth 46°46′45.8″N 92°5′35.3″W / 46.779389°N 92.093139°W / 46.779389; -92.093139 (Duluth Aerial Ferry/Lift Bridge )
Minnesota
United States
bridges
274
2017
Mississippi River Basin Model [ 14]
1966
Jackson 32°18′21.8″N 90°19′8.2″W / 32.306056°N 90.318944°W / 32.306056; -90.318944 (Mississippi River Basin Model )
Mississippi
United States
research & educational
275
2017
Chaffey Brothers Irrigation Works [ 15]
1887
Mildura and Renmark 34°15′1.6″S 142°13′28.8″E / 34.250444°S 142.224667°E / -34.250444; 142.224667 (Chaffey Brothers Irrigation Works )
Victoria and South Australia
Australia
water supply & control
276
2017
Qhapaq Ñan: The Great Inka Road System [ 16]
1000 BC - 1533 AD
13°13′0.3″S 72°23′5.2″W / 13.216750°S 72.384778°W / -13.216750; -72.384778 (Qhapaq Ñan: The Great Inka Road System )
Colombia to Chile
roads & rails
277
2017
Tunnel of Eupalinos [ 17]
520 BC
Samos 37°41′40.6″N 26°55′48″E / 37.694611°N 26.93000°E / 37.694611; 26.93000 (Tunnel of Eupalinos )
North Aegean
Greece
tunnels
278
2018
Augusta Canal and Industrial District
1845
Augusta 33°31′17.6″N 82°0′38.9″W / 33.521556°N 82.010806°W / 33.521556; -82.010806 (Augusta Canal and Industrial District )
Georgia
United States
power generation
279
2018
Old River Station[ 18]
1907
Cincinnati 39°4′17″N 84°25′40″W / 39.07139°N 84.42778°W / 39.07139; -84.42778 (Old River Station )
Ohio
United States
water supply & control
280
2018
Boundary Layer Wind Tunnel Laboratory [ 19]
1965
London 43°0′14″N 81°16′32.5″W / 43.00389°N 81.275694°W / 43.00389; -81.275694 (Boundary Layer Wind Tunnel Laboratory )
Ontario
Canada
research & educational
281
2018
Institution of Civil Engineers [ 20]
1818
London 51°30′4″N 0°7′44.4″W / 51.50111°N 0.129000°W / 51.50111; -0.129000 (Institution of Civil Engineers )
England
research & educational
282
2018
Union Chain Bridge [ 21]
1820
Horncliffe to Fishwick 55°45′9.3″N 2°6′24.4″W / 55.752583°N 2.106778°W / 55.752583; -2.106778 (Union Chain Bridge )
England to Scotland
bridges
283
2019
Kaibab Trail Suspension Bridge [ 22]
1928
Grand Canyon 36°6′53.2″N 112°5′21.1″W / 36.114778°N 112.089194°W / 36.114778; -112.089194 (Kaibab Trail Suspension Bridge )
Arizona
United States
bridges
284
2019
Union Pacific Railroad [ 23]
1868
Omaha westward41°15′0.9″N 95°55′37.4″W / 41.250250°N 95.927056°W / 41.250250; -95.927056 (Union Pacific Railroad )
Nebraska
United States
roads & rails
285
2019
Silver Bridge Collapse - Creation of National Inspection Standards [ 24]
1967
Point Pleasant 38°50′42″N 82°8′28″W / 38.84500°N 82.14111°W / 38.84500; -82.14111 (Silver Bridge Collapse - Creation of National Inspection Standards )
West Virginia
United States
bridges
286
2020
NASA Vehicle Assembly Building [ 25]
1966
Titusville 28°35′11″N 80°39′5″W / 28.58639°N 80.65139°W / 28.58639; -80.65139 (NASA Vehicle Assembly Building )
Florida
United States
buildings
287
2021
Main Avenue Bridge [ 26]
1939
Cleveland 41°29′55.2″N 81°42′18.5″W / 41.498667°N 81.705139°W / 41.498667; -81.705139 (Main Avenue Bridge )
Ohio
United States
bridges
288
2021
Sydney Opera House [ 15]
1973
Sydney 33°51′24″S 151°12′55″E / 33.85667°S 151.21528°E / -33.85667; 151.21528 (Sydney Opera House )
New South Wales
Australia
buildings
289
2022
David Thompson's Surveying and Mapping of the Northwest of North America[ 27]
1814
Canada & United States
surveys & maps
290
2022
Portage Lake Bridge [ 28]
1959
Hancock and Houghton 47°7′25.9″N 88°34′26.7″W / 47.123861°N 88.574083°W / 47.123861; -88.574083 (Portage Lake Bridge )
Michigan
United States
bridges
291
2022
Salmon Creek Dam [ 29]
1914
Juneau 58°20′30″N 134°24′12″W / 58.34167°N 134.40333°W / 58.34167; -134.40333 (Salmon Creek Dam )
Alaska
United States
dams