9,860 articles
Nymphaeum of via degli Annibaldi
Nymphaeum of via degli Annibaldi (Ninfeo di via degli Annibaldi), Roman monumental fountain on Rome's Oppian Hill, 50 BC to Augustan era, found 1895; shell-and-glass wall mosaic, nine-niche apse, 1.45 m basin, cut by the modern street.
Nyungwe National Park
Nyungwe National Park is a 101,963.67-hectare montane rainforest in south-western Rwanda, a UNESCO World Heritage Site since 2023 under criterion (x), contiguous with Burundi's Kibira National Park and managed with African Parks since 2020.
O Le Pupū Puē National Park
O Le Pupū Puē National Park, Samoa's first national park (1978) and the first in the South Pacific, protects 5,019 ha of Upolu forest from Mt. Vaivai to the Le Pupū lava cliffs; Ramsar Site 2313.
O! World
O! World (대전오월드) is a theme park in Daejeon, South Korea, combining a zoo, botanical gardens, an amusement park, and a bird park, opened in 2009.
Oak Mountain State Park
Oak Mountain State Park in Pelham, Alabama, near Birmingham, is the state's largest state park, established 1927, with 100+ miles of trails, Peavine Falls, golf, camping, and the Alabama Wildlife Center.
Oakmere hill fort
Oakmere hill fort (Oakmere Camp), Cheshire: small univallate Iron Age promontory fort on a headland into Oak Mere, 0.9 ha, excavated 1960 by Forde-Johnston, scheduled monument 1013291.
Oakwood Roman fort
Oakwood Roman fort is a Flavian-era Roman auxiliary fort and adjacent temporary camp in the Scottish Borders, 3.5 miles southwest of Selkirk. Occupied about AD 80/81 to AD 100, excavated 1951–52 by Steer and Feachem, scheduled as SM1726.
Oasis de la Sierra El Pilar
Oasis de la Sierra El Pilar, Ramsar site 1794, is a 180,803-hectare wetland of oases on the western slope of the Sierra del Mechudo, Baja California Sur, Mexico, designated 2 February 2008.
Oasis de Moghrar et de Tiout
Oasis de Moghrar et de Tiout, Ramsar Site 1302 in Naama province, Algeria: 195,500 ha of desert oases (Moghrar Foukani, Tahtani, and Tiout) with foggara water systems, designated 4 June 2003.
Oasis de Tamantit et Sid Ahmed Timmi
Oasis de Tamantit et Sid Ahmed Timmi, Ramsar Site no. 1061 in Adrar, Algeria, designated 2001: 95,700 ha of Saharan oases irrigated by foggara underground galleries tapping the Albian aquifer.
Oasis du Kawar
Oasis du Kawar is a chain of oases in the Agadez region of northeastern Niger, designated a Ramsar wetland site in 2005 and known for its date palms.
Oasis du sud marocain Biosphere Reserve
Oasis du sud marocain Biosphere Reserve (RBOSM), a UNESCO MAB reserve in southern Morocco designated in 2000, covering 7,185,371 ha with 1,635,008 people, khettara-irrigated date oases, and the Ksar of Ait-Ben-Haddou World Heritage site.
Obelisco de Buenos Aires
Obelisco de Buenos Aires: 67.5 m reinforced-concrete monument by Alberto Prebisch, inaugurated 23 May 1936 for the city's 400th anniversary at 9 de Julio and Corrientes; national historic monument with a public mirador since 2025.
Obelisk
Obelisk (Egyptian tekhen): a tapering monolithic stone pillar with a pyramidal cap, invented in ancient Egypt as a solar monument, later carried off to Rome and worldwide; Rome holds 13, more than Egypt.
Oberaden
Oberaden (Römerlager Oberaden), Roman legionary fortress at Bergkamen-Oberaden, Westphalia, Germany; built 11 BCE in Drusus's Germanic wars, 56 ha, two legions, timber-and-earth wall, abandoned 8/7 BCE; identified with Cassius Dio's Lippe-Eliso stronghold.
Oberhochstatt
Oberhochstatt is the site of a small Roman fort of the Raetian Limes near Weißenburg in Bavaria, Germany, known mainly through aerial photography and magnetometry.
Obersalzberg
Obersalzberg is a mountain area above Berchtesgaden in the Bavarian Alps, near the Austrian border, known as the site of Adolf Hitler's mountain residence, the Berghof.
Oberscheidental
Oberscheidental is a Roman auxiliary cohort fort located on the older Odenwald line of the Neckar-Odenwald Limes in Germany. It was constructed around 100 AD.
Oberstimm
Oberstimm: Roman auxiliary fort near Manching, Bavaria, occupied c. AD 40–120, excavated 1968–1971 by Hans Schönberger; also the findspot of two 15-metre Roman Danube patrol boats.
Oberweis
Oberweis (Römische Villa Oberweis): a large palatial Roman porticus villa with corner risalits near Bitburg, Rhineland-Palatinate, Germany. Built from about AD 100, main house 124-130 m long with mosaics, marble, wall paintings, and baths; excavated 1877/78, abandoned late 4th century.
Obihiro Zoo
Obihiro Zoo (おびひろ動物園) is a municipal zoo in Midorigaoka, Obihiro, Hokkaido, opened in 1963. Known as Japan's first to keep tropical animals through cold-tolerance methods, with polar bear Aira and native Hokkaido species.
Obilonna
Obilonna (also Obilunnum, Obilinnum) is a Roman road station on the Tabula Peutingeriana in the Graian Alps, Savoie, France, usually identified with La Bâthie or Conflans on the Vienne to Darantasia road.
Oblin
Oblin (site 5, Gmina Maciejowice, Poland): a fully excavated Przeworsk culture cremation cemetery on the Vistula, dug 1986–1995 by Katarzyna Czarnecka; about 314 graves from the 2nd century BC to the 2nd century AD, distinct from the eastern Przeworsk zone.
Obtawaing Biosphere Reserve
Obtawaing Biosphere Reserve (Obtawaing Biosphere Region), a UNESCO Man and the Biosphere site in Northern Michigan designated in 1979 as the University of Michigan Biological Station reserve, expanded and renamed in 2021, spanning Lakes Huron, Michigan, and Superior.
Occaraba
Occaraba, an ancient town of Roman Syria on the Tabula Peutingeriana, also Orarabon, Ovvariba, Akoraba; identified with 'Agerbat/Uqayribat, Barrington Atlas 68 D3, Pleiades 668322, dated Roman/Late Antique.
Ocean Fantasy Museum
Ocean Fantasy Museum (澄清湖海洋奇珍園) is a small aquarium in Niaosong District, Kaohsiung, Taiwan, inside a 1959 anti-nuclear underground command center at Chengcing Lake with a 200 m tunnel, 5,000 kg blast doors, eight exhibit areas, and a 13 m sperm whale skeleton; closed for renovation June 2026.
Ocean Park Hong Kong (香港海洋公园)
Ocean Park Hong Kong (香港海洋公園) is a not-for-profit statutory theme park on Hong Kong Island's south side, opened in 1977, with six giant pandas, the Grand Aquarium, and a 1.5 km cable car, distinct from Hong Kong Disneyland.
Ocean View Cart Racing
Ocean View Cart Racing (오션뷰카트) is a seaside go-kart theme park in Mangchi-ri, Irun-myeon, Geoje-si, South Gyeongsang, South Korea, at Geoje-daero 1514-18, also offering paintball, laser tag, bumper cars, and a sky swing.
Ocean Water Park
Ocean Water Park (پارک آبی اوشن) is Iran's first themed, first outdoor water park, a 5.6-hectare pirate-story park opened 2017 on Kish Island with 13 rides, 4 pools, a spa, and gender-separated sessions.
Očkov
Očkov is a village and municipality in the Nové Mesto nad Váhom district, Trenčín Region, western Slovakia, known for a Bronze Age chieftain's burial mound.