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 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, New Mexico to Antonito, Colorado 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, Maryland to Vandalia, Illinois 39°57′38.7″N 82°27′2″W / 39.960750°N 82.45056°W / 39.960750; -82.45056 (National Road )
Midwest
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 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
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
110
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
111
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
112
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
113
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
114
1984
Panama Canal
1914
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
115
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
116
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
117
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
118
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
119
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
120
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
121
1985
Forth Railway Bridge
1890
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
122
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
123
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
124
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
125
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
126
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
127
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
128
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
129
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
130
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
131
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
132
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
133
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
134
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
135
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
136
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
137
1986
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
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
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
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
1994
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 Water Supply
1901
Seattle 47°25′9.2″N 121°46′54.4″W / 47.419222°N 121.781778°W / 47.419222; -121.781778 (Cedar Falls Water Supply )
Washington
United States
water supply & control
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
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
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
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
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
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
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
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
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
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
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
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
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
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
2015
Gladesville Bridge
1964
Sydney
New South Wales
Australia
bridges
2016
Cape Agulhas Lighthouse
1848
L'Agulhas
South Africa
water transportation
2016
Arrowrock Dam
1912
Boise and Elmore
Idaho
United States
dams
2017
Bonnet Carré Spillway
1931
St. Charles Parish
Louisiana
United States
dams
2018
Augusta Canal and Industrial District
1845
Augusta
Georgia
United States
power generation
2018
Institution of Civil Engineers
1818
research & educational
2019
Kaibab Trail Suspension Bridge
1928
Grand Canyon
Arizona
United States
bridges
2019
Union Pacific Railroad [ 10]
1868
Kenefick Park Omaha
Nebraska
United States
roads & rails
2019
Silver Bridge Collapse - Creation of National Inspection Standards [ 11]
1967
Point Pleasant
West Virginia
United States
bridges
2020
NASA Vehicle Assembly Building [ 12]
1966
Titusville
Florida
United States
buildings
2021
Main Avenue Bridge [ 13]
1939
Cleveland
Ohio
United States
bridges
2021
Sydney Opera House [ 14]
1973
Sydney
New South Wales
Australia
buildings
2022
Portage Lake Bridge [ 15]
1959
Hancock and Houghton
Michigan
United States
bridges