Category:Start-Class Historic sites articles

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• Talk:Ōfune Site
• Talk:Ogasawara clan castle sites
• Talk:Ogatamiyasako East Stone Buddhas
• Talk:Ogatamiyasako West Stone Buddhas
• Talk:Ogōri Kanga ruins
• Talk:Oguni Castle (Tsuruoka)
• Talk:Ogura Castle
• Talk:Ogurayama Castle
• Talk:Ōguruwa Shell Midden
• Talk:Ōgushi Shell Mound
• Talk:Ogyū Castle
• Talk:Ōhara temple ruins
• Talk:Ōhara Yūgaku
• Talk:Ohio Homestead
• Talk:Ōhira Ichirizuka
• Talk:Ohitayama Tatara Iron Works
• Talk:Ōhora Shell Mound
• Talk:Oibora-Asakura Sue Ware Kiln Site
• Talk:Oiso Shrine
• Talk:Ōita Motomachi Stone Buddhas
• Talk:Ōiwayama Kofun Cluster
• Talk:Ōjiyama Kofun
• Talk:Oka Castle
• Talk:Okadaira Shell Mound
• Talk:Okadayama Kofun
• Talk:Okameishi Kofun
• Talk:Okamoto Castle (Chiba)
• Talk:Okayama Domain Han School
• Talk:Okayama Domain Ikeda clan cemetery
• Talk:Okeechobee Battlefield
• Talk:Okinohara Site
• Talk:Okishio Castle
• Talk:Okō Castle
• Talk:Okozu Salt Works
• Talk:Okunoyama Kofun
• Talk:Okuyama shōjōkan
• Talk:Öküz Mehmed Pasha Caravanserai
• Talk:Okyōzuka Site
• Talk:Old Adaminaby and Lake Eucumbene
• Talk:Old Albuquerque High School
• Talk:Old All Saints Church, Nuneham Courtenay
• Talk:Old All Saints Church, Skelton-in-Cleveland
• Talk:Old Banten
• Talk:Old Bar Airfield
• Talk:Old Bishop's Palace, Chester
• Talk:Old Bunbury railway station
• Talk:Old Cahokia Courthouse
• Talk:Old Casino railway station
• Talk:Old Castle Lachlan
• Talk:Old Cathedral of Lleida
• Talk:Old Cathedral of Plasencia
• Talk:Old church of Santa Galla (Rome)
• Talk:Old Church of St James, Upton
• Talk:Old Church of St Mary the Virgin, Preston Candover
• Talk:Old Church of St Nicholas, Uphill
• Talk:Old City Hall (Guelph)
• Talk:Old City of Freiburg
• Talk:Old Colombo Dutch Hospital
• Talk:Old Como railway bridge
• Talk:Old Conduit House
• Talk:Old Constitution House
• Talk:Old Core of Zemun
• Talk:Old Court Theatre, Scone
• Talk:Old Custom House Inn, Chester
• Talk:Old Dee Bridge
• Talk:Old Deer
• Talk:Old Deer Park
• Talk:Old Dutch Hospital, Galle
• Talk:Old Erie Canal State Historic Park
• Talk:Old Farm, Strawberry Hill
• Talk:Old Fire Station, Chiswick
• Talk:Old Franklinton Cemetery
• Talk:Old Gala House
• Talk:Old Hospital de la Santa Creu, Barcelona
• Talk:Bell Farm House, Harrietsham
• Talk:Old Iloilo City Hall
• Talk:Old Kerosene Store
• Talk:Old Kia Kima
• Talk:Old King's Head Hotel, Chester
• Talk:Old King's School, Parramatta
• Talk:The Old Kings Arms
• Talk:The Old Manor, Croscombe
• Talk:Old Market (Omaha, Nebraska)
• Talk:Old Market House (Galena, Illinois)
• Talk:Old Market Square, Potsdam
• Talk:Old Marulan Town
• Talk:The Old Maskinsnedkeri
• Talk:Old Mittagong Post Office
• Talk:Old Newcastle Club Building
• Talk:Old Newcastle East Public School
• Talk:Old Oaks Farm
• Talk:Old Orhei
• Talk:Old Oton Church
• Talk:Old Pack Horse
• Talk:Old Police Barracks, Goulburn
• Talk:Old Police Station, Bath
• Talk:Old Port of Marseille
• Talk:Old Punch Bowl
• Talk:Old Rectory, Carcoar
• Talk:Old Rome, South Ayrshire
• Talk:Old Sakai Lighthouse
• Talk:Old Sarum Castle
• Talk:Old Sarum Cathedral
• Talk:Old Scatness
• Talk:Old Sir Joseph Banks Hotel
• Talk:Old St Andrew's Church, Kingsbury
• Talk:Old St Bartholomew's Church, Lower Sapey
• Talk:Old St Cuthbert's Church, Oborne
• Talk:Old St John the Baptist's Church, Pilling
• Talk:Old St Leonard's Church, Langho
• Talk:Old St Mary's Church, West Bergholt
• Talk:Old St Matthew's Church, Lightcliffe
• Talk:Old St Paul's Anglican Church, Deniliquin
• Talk:Old St Peter's Church, Thurso
• Talk:Old St Stephen's Church, Fylingdales
• Talk:Old State Capitol State Historic Site
• Talk:Old Sugarmill
• Talk:Old Supreme Court Chamber
• Talk:Old town Osnabrück
• Talk:Old Trinity Church
• Talk:Oldberry Castle
• Talk:Oldbury Farm
• Talk:Oldholme
• Talk:Olustee Battlefield Historic State Park
• Talk:Øm Abbey
• Talk:Omaha Central High School
• Talk:Ōmaruyama Kofun
• Talk:Ōmi Kokuchō
• Talk:Ōmi Ōtsu Palace
• Talk:Ōmidō temple ruins
• Talk:Ōmijima
• Talk:Ōmine Okugakemichi
• Talk:Omishinkanji Kofun
• Talk:Ōmiyama ruins
• Talk:Omni La Costa Resort & Spa
• Talk:Omni Royal Orleans
• Talk:Ōmori Katsuyama Site
• Talk:Ōmori Shell Mound
• Talk:Ōmoto Kofun
• Talk:Ōmura Cave Tomb Cluster
• Talk:Ōmuro Kofun group
• Talk:Ōnaka Site
• Talk:One Oak, Frognal
• Talk:One Pillar Pagoda
• Talk:Oni-no-iwa Kofun
• Talk:Onizuka Kofun (Kunisaki)
• Talk:Onna-bori
• Talk:Ōno Castle (Chikuzen Province)
• Talk:Ōno-ji
• Talk:Ōno-no-Iwa Kofun
• Talk:Ōnodai Dolmen Cluster
• Talk:Onoe Kurumayama Kofun
• Talk:Ōnohara Kofun cluster
• Talk:Onsen-ji (Nagano)
• Talk:Onslow Square
• Talk:Ontario Heritage Act
• Talk:Ontsuka - Gongenzuka Kofun
• Talk:Oostende Castle
• Talk:Oosterkerk, Groningen
• Talk:Oppidum d'Ensérune
• Talk:Oran Park (homestead)
• Talk:Orani Church
• Talk:Oratorio di Santa Maria in Valle
• Talk:Oratory of St Thomas Aquinas, Florence
• Talk:Ore Place
• Talk:Oriana Cinema
• Talk:Orielton, Harrington Park
• Talk:Orion Church
• Talk:Oriskany Battlefield State Historic Site
• Talk:Oronsay Priory
• Talk:Orsan Priory
• Talk:Oruawharo Homestead
• Talk:Osage Village State Historic Site
• Talk:Osborne House, Millers Point
• Talk:Ōshikakubo ruins
• Talk:Ōshima Hatakeda Site
• Talk:Osian, Jodhpur
• Talk:Osmington White Horse
• Talk:Osney Abbey
• Talk:Ossulston House
• Talk:Østerlars Church
• Talk:Ostrý Kameň Castle
• Talk:Ōsumi Kokubun-ji
• Talk:Ōsuzukami Site
• Talk:Oswald Bond Store
• Talk:Ōta Tenjinyama Kofun
• Talk:Otahuna
• Talk:Ōtaka Kanga ruins
• Talk:Ōtani Kofun
• Talk:Otham Manor
• Talk:Otomefudōhara Tile Kiln
• Talk:Otomezuka Kofun
• Talk:Ōtoriiyama ruins
• Talk:Otōyama Kofun
• Talk:Otozuka Kofun - Danjirimaki Kofun
• Talk:Ōtsuka Senju Bosho
• Talk:Ōtsuka-Saikachido Site
• Talk:Ōtsukayama Kofun
• Talk:Ōtsurumaki Kofun
• Talk:Ottery Mine