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Old Oswestry
Old Oswestry (Caer Ogyrfan, Yr hen Ddinas) is a large multivallate Iron Age hillfort on a glacial mound north of Oswestry, Shropshire, with five rampart rings, unique western entrance hollows, reuse in Wat's Dyke, WWI trenches, and Scheduled Monument status since 1934.
Old Palace at Assur
Old Palace at Assur (Alter Palast): royal palace of ancient Assur, first built under Šamši-Adad I (c. 1815–1782 BC), rebuilt over millennia, burial place of Assyrian kings, excavated by Andrae 1903–1914.
Old Post Office (Washington, D.C.)
Old Post Office, Washington, D.C.: 1899 Richardsonian Romanesque federal building at 1100 Pennsylvania Avenue NW with a 315-foot clock tower; former Post Office Department headquarters, later Trump International Hotel, now Waldorf Astoria Washington D.C.
Old Quebec
Old Quebec (Vieux-Québec) is Quebec City's historic district, founded by Champlain in the early 17th century and a UNESCO World Heritage Site since 1985, with 4.6 km of preserved ramparts, the Citadel, and Martello towers.
Old Ramsar Hotel
Old Ramsar Hotel (هتل قدیم رامسر), also Grand Ramsar or Ramsar Azadi Hotel: Art Deco Pahlavi-era hotel in Ramsar, Mazandaran, Iran, built 1932–1938 by German architects, National Heritage no. 1520, host of the 1971 Ramsar Convention, now under restoration.
Old Rauma
Old Rauma (Vanha Rauma), UNESCO World Heritage Site since 1991 in Rauma, Finland: a 29-hectare medieval wooden town centre of about 600 buildings, criteria iv and v, largest coherently preserved Nordic wood town.
Old Temple of Athena Polias at Athens
The Old Temple of Athena Polias (Archaios Neos) was the late-sixth-century BC Archaic temple on the Athenian Acropolis housing the olive-wood cult statue of Athena, burned by Persians in 480 BC; its ruins and fate remain debated.
Old Town Hall (near Carlisle)
Old Town Hall (near Carlisle): the Grade I listed 1668-9 former town hall on Market Place, Carlisle, with a 1717 clock-tower extension, facing the 1682 Market Cross, now housing the Tourist Information Centre.
Old Town Hall (near South Shields)
The Old Town Hall in South Shields is a small Grade I listed building of 1768 standing at the center of the Market Place, the town's civic center until 1910.
Old Town Lunenburg
Old Town Lunenburg, Nova Scotia: UNESCO World Heritage Site (1995, criteria iv and v), the best surviving planned British colonial settlement in North America, founded 1753 on Charles Morris's intact grid plan with 404 mostly wooden buildings.
Old Town of Ávila with its Extra-Muros Churches
Old Town of Ávila with its Extra-Muros Churches (Ciudad Vieja de Ávila y sus iglesias extramuros), UNESCO World Heritage serial site in Castile and León, Spain, inscribed 1985: intact 2,516 m medieval walls, four Romanesque extra-muros churches, 2007 extension adding three churches and three convents.
Old Town of Cáceres
Old Town of Cáceres (Ciudad Vieja de Cáceres), a 9-ha walled medieval ensemble in Extremadura, Spain, UNESCO World Heritage since 1986 under criteria iii and iv, with Almohade walls, about 30 Muslim-period towers including the Torre del Bujaco, and Gothic-Renaissance noble palaces.
Old Town of Corfu
Old Town of Corfu (Kerkyra): fortified historic center on Corfu island at the Adriatic entrance, UNESCO-listed 2007 under criterion (iv); Venetian 1386–1797, then French, British (1815–1864) and Greek rule; Old and New Fortresses, neoclassical fabric, 70 ha property.
Old Town of Ghadamès
Old Town of Ghadamès (غدامس), Libya's 'Pearl of the Desert', a mud-brick oasis town 650 km southwest of Tripoli, UNESCO World Heritage Site since 1986, danger-listed 2016–2025, with women's rooftop terraces and covered streets.
Old town of Kuldīga
Old town of Kuldīga (Goldingen), Latvia: UNESCO World Heritage site since 2023 (criterion v), a well-preserved 13th–20th century urban settlement and former ducal residence of Courland and Semigallia, 84.33 ha with 88.85 ha buffer zone.
Old Town of Lijiang
The Old Town of Lijiang (丽江古城) is a historic Naxi town in northwest Yunnan, China, with over 800 years of history, inscribed by UNESCO in 1997.
Old town of Regensburg with Stadtamhof
Old town of Regensburg with Stadtamhof, Bavaria: UNESCO World Heritage Site since 2006 (criteria ii, iii, iv), 182.8 ha on the Danube with 984 historic buildings, 12th-century Stone Bridge, seat of the Perpetual Imperial Diet 1663-1806.
Old Town, Edinburgh
The Old Town, also called Auld Toun, is the medieval core of Edinburgh, Scotland, stretching along a ridge from Edinburgh Castle to Holyrood, linked by the Royal Mile.
Old Village of Hollókő and its Surroundings
The Old Village of Hollókő is a UNESCO World Heritage Site in northern Hungary, a preserved Palóc farming village with a medieval castle, listed in 1987.
Old Walled City of Shibam
Old Walled City of Shibam, Yemen: 16th-century fortified mud-brick tower city in Wadi Hadramaut, nicknamed the Manhattan of the desert; UNESCO World Heritage Site since 1982, in Danger since 2015.
Oldberry Castle (United Kingdom)
Oldberry Castle, also called Oldbury Castle, is a slight univallate Iron Age hillfort on a promontory above the River Barle near Dulverton, Somerset, scheduled as monument 1006168 since 1961.
Oldcoates
Oldcoates: site of a Scheduled Roman villa at Styrrup with Oldcotes, Bassetlaw, Nottinghamshire, found in May 1870 during construction of St Helen's Church, with tessellated pavements and a 20 by 17 ft principal room.
Olduvai Gorge
Olduvai Gorge (Oldupai Gorge), in Tanzania's Ngorongoro Conservation Area, is a major paleoanthropological site with a 2-million-year record of Oldowan and Acheulean tools, Paranthropus boisei and Homo habilis fossils, and Leakey expeditions.
Olivula
Olivula (Portus Olivula) is an ancient Ligurian coastal place and harbor on the Maritime Itinerary, five Roman miles from Nicaea, identified near the Gulf of Villefranche east of Nice; also a fossil snail genus and a Roman female name.
Ollantaytambo
Ollantaytambo: Inca town and archaeological site in Peru's Sacred Valley, 82 km from Cusco, built under Pachacutec, site of the 1536 Inca victory over Hernando Pizarro, a living Inca town and UNWTO Best Tourism Village.
Olteni
Olteni (Covasna County, Romania) is a village in Bodoc commune, the site of a Roman auxiliary fort under Mikó Castle on the Olt, guarding the Tușnad pass within Roman Dacia's northeastern limes.
Olvera Street
Olvera Street is a block-long pedestrian Mexican marketplace in El Pueblo de Los Angeles Historical Monument, downtown Los Angeles, opened Easter Sunday 1930 through Christine Sterling's campaign; home of the 1818 Avila Adobe.
Olympiastadion (Munich)
Olympiastadion (Munich Olympic Stadium), built for the 1972 Summer Olympics by Behnisch, Frei Otto, and Schlaich under a 78,000 m² acrylic tent roof; FC Bayern's home for 33 years, 1974 World Cup final venue, listed monument closed for renovation until 2029.
Olympic National Forest
Olympic National Forest: a 632,000-acre U.S. National Forest on Washington's Olympic Peninsula, created as the Olympic Forest Reserve in 1897 and forerunner of Olympic National Park.
Olympic National Park
Olympic National Park is a national park in Washington State's Olympic Peninsula west of Seattle, designated in 1938 and protecting mountains, Pacific coast, and temperate rain forest.