Parks, protected areas, and geographic heritage sites

Øresund Aquarium

Øresund Aquarium (Øresundsakvariet), founded 1972 in Helsingør, is a small saltwater aquarium of the University of Copenhagen's Department of Biology showing local Øresund and Kattegat marine life, with biotope, themed, and touch tanks, a Water Laboratory, and RIB sea safaris.

Oriental Land (site)

Oriental Land (东方绿舟) is a large education-and-leisure park opened in 2001 near Dianshan Lake in Qingpu District, Shanghai, run by the city education commission, with a full-scale replica aircraft carrier, 16 scenic spots, and AAAA rating.

Oriental Science Fiction Valley VR Theme Park

Oriental Science Fiction Valley (东方科幻谷) was China's first large VR theme park in Guiyang, Guizhou, opened April 29, 2018 with 15 halls, a 51.8 m robot, and later closed before a planned revival.

Oriental Village

Oriental Village (Burau Bay, Langkawi) is an open-air shopping and entertainment complex at the foot of Mount Mat Cincang, base of the Langkawi Cable Car (SkyCab) and SkyBridge, with free entry, 95-plus outlets, and paid attractions.

Orígens UNESCO Global Geopark

Orígens UNESCO Global Geopark (Conca de Tremp-Montsec), designated 2018, is a 2,050 km² geopark in Lleida, Catalonia, Spain, with over 500 million years of Pyrenean geological history and Europe's main dinosaur egg site.

Oriza/Oruba/Oresa

Oriza/Oruba/Oresa, an ancient place in the Syrian steppe identified with the oasis of Tayibe north of Palmyra; attested in Ptolemy, the Tabula Peutingeriana, and the Notitia Dignitatum as a base of Legio IV Scythica on the Strata Diocletiana.

Orkhon Valley Cultural Landscape

The Orkhon Valley Cultural Landscape (Орхоны хөндийн соёлын дурсгалт газар) is a UNESCO World Heritage Site in central Mongolia, inscribed in 2004 along the Orkhon River some 360 km southwest of Ulaanbaatar.

Orman Botanic Garden

Orman Botanic Garden, also El-Orman Garden (Arabic حديقة الأورمان), is a historic botanical garden in Giza, Egypt, established by Khedive Ismail in the 1870s as part of the Giza Royal Palace gardens.

Ornithologic zoo

Bainiao Garden (百鸟园), an aviary zoo on Yingxiong Mountain in Qinyuan, Gulangyu, Xiamen; about 7,000 m², over 80–100 bird species and roughly 1,000 birds, with bird shows and feeding displays.

Orsingen

The Roman vicus of Orsingen was a civil settlement under the modern village of Orsingen in Baden-Württemberg, occupied from about 80 AD to around 260 AD.

Orsologiakos/Rosolodiacus

Orsologiakos/Rosolodiacus (Orosologia, Rosolodiaco), a Roman road station in Galatia, Turkey, cited BAtlas 63 B1, identified with Deliler Çiftliği, Ankara Province; attested by Ptolemy, the Antonine Itinerary, and the 333 AD Bordeaux Pilgrim.

Ørsted Dal, Pingel Dal and Enhjørningen Dal

Ørsted Dal, Pingel Dal and Enhjørningen Dal, Ramsar Site no. 2021 in Kommuneqarfik Sermersooq, East Greenland: three valleys designated 8 June 2011, 196,000 ha of high-Arctic valley wetlands with geese, muskox, and endemic plants.

Orto Botanico dell'Università degli Studi di Cagliari

The Orto Botanico dell'Università degli Studi di Cagliari, formally the Hortus Botanicus Karalitanus, is a botanical garden founded by the University of Cagliari in Cagliari, Sardinia, in 1866.

Orto dei Semplici Elbano

Orto dei Semplici Elbano: botanical garden of about one hectare at the Eremo di Santa Caterina, Rio nell'Elba, Elba; founded 1992 by Corsi, Garbari and Berger, opened 1997; conserves Tuscan Archipelago medicinal and endemic plants.

Orto e Museo Botanico di Pisa

Orto e Museo Botanico di Pisa (Botanic Garden and Museum of the University of Pisa), founded 1543-44 by Luca Ghini under Cosimo I de' Medici; the world's oldest university botanic garden, moved twice, now about two hectares with 3,000 plants and a 350,000-specimen herbarium.

Orumiyeh (protected area)

Orumiyeh (Lake Urmia) protected area and freshwater ecoregion 445 in northwest Iran: a Ramsar site, national park, and UNESCO Biosphere Reserve, a fishless hypersaline lake with endemic Artemia and unique endemic fish fauna.

Os Ancares Lucenses y Montes de Cervantes, Navia y Becerrea Biosphere Reserve

Os Ancares Lucenses y Montes de Cervantes, Navia y Becerreá Biosphere Reserve: UNESCO MaB reserve declared 27 October 2006 in eastern Lugo, Galicia, Spain; 53,664 ha across Cervantes, Navia de Suarna, and Becerreá, managed by the Diputación de Lugo.

Osaka Aquarium Kaiyukan

Osaka Aquarium Kaiyukan (海遊館), opened 20 July 1990 at Tempozan, Osaka Bay; designed by Peter Chermayeff; 5,400-ton Pacific tank with whale sharks; about 620 species, 30,000 animals; 90 million visitors by 2025.

Osama bin Laden's compound in Abbottabad

Osama bin Laden's compound in Abbottabad, Pakistan, also called Waziristan Haveli, was his walled hiding place from about 2005 until the US Navy SEAL raid of May 2, 2011 killed him; its seized documents became the Abbottabad Compound Collection.

Oshino Shinobi no Sato

Oshino Shinobi no Sato (忍野しのびの里), the Oshino Ninja Village, is a ninja theme park in Oshino Village, Yamanashi, at the foot of Mt. Fuji, with Raifuujin ninja shows, a Karakuri trick house, shuriken dojo, and costume rental.

Osmanthorpe Roman vexillation fortress

Osmanthorpe Roman vexillation fortress (Osmanthorpe Camp), Edingley, Nottinghamshire: a scheduled 1st-century double-ditched Roman military enclosure of 8.8 ha, known from cropmarks, one of 14 recorded in England.

Ossaia

Ossaia (Ossaia–La Tufa) is a Roman villa site near Cortona, Tuscany, on a via Cassia branch. Built late Republican, owned by the Vibii Pansae then the imperial fiscus, occupied to the 5th century AD.

Ossuary

Ossuary: a chest, room, or structure holding disarticulated human bones from secondary burial. Forms range from Chalcolithic and Judean limestone bone boxes to medieval charnel chapels and the Paris Catacombs, which hold about six million Parisians' remains.

Osterburken

Osterburken, Germany: Roman fort on the Upper German-Raetian Limes, built about 160 CE, cohort fort of 2.14 ha plus 185–192 CE annex, garrisoned by Aquitanian cohort and Brittonum numerus, with Mithraeum and beneficiarii shrine.

Ostia Antica

Ostia Antica, the archaeological park of ancient Rome's harbor city at the Tiber mouth (Latin ostium), founded as a castrum in the 4th century BC, at its 2nd-century-AD peak home to some 50,000 people, excavated since 1802.

Ostriv Rozvah (Island of Entertainment)

Острів Розваг (Island of Entertainment): Ukrainian family entertainment brand; Zhytomyr indoor park opened 2012 in TRC Global UA, over 3,000 m²; trademark 174580; LLC Ostriv Rozvah, USREOU 38923806, Kyiv; also a Kremenchuk venue.

Ostrog Monastery (Манастир Острог)

Ostrog Monastery (Манастир Острог) is a Serbian Orthodox monastery built into a cliff of Ostroška Greda near Nikšić, Montenegro, founded around Saint Basil of Ostrog in the 17th century, with cave churches of the Holy Cross (1665) and the Presentation holding his relics.

Ostrovany

Ostrovany (Osztópataka, Ósztrópataka) is a village in Sabinov District, eastern Slovakia, on the Torysa river, known for Germanic princely graves found in 1790 and 1865, dated 270–290 AD, and a 1248 first written record.

Osun-Osogbo Sacred Grove

The Osun-Osogbo Sacred Grove is a 75-hectare forest sanctuary in Osogbo, Nigeria, home of the Yoruba fertility goddess Osun and a UNESCO World Heritage Site since 2005.