Turkmenistan · Zone
Old Nisa — Parthian Capital
Twelve kilometres west of modern Ashgabat lies the first capital of the Parthian Empire — the vast Iranian…
Function
Archaeological site
809 places
Tanzania · Zone
Olduvai Gorge
A steep-sided ravine cutting through the eastern Serengeti, Olduvai Gorge is the single most important site in the…
Peru · Zone
Ollantaytambo
The oldest continuously occupied planned settlement in the Americas — its original Inca street grid and canal system…
Ethiopia · Zone
Omo River
Ethiopia's greatest river outside the Nile Basin, the Omo Valley ranks among the world's most significant sources of…
Campania · Zone
Oplontis — La Villa di Poppea: la Più Grande Villa Romana Conservata (UNESCO 1997)
The largest Roman suburban villa ever excavated — 11,000 square metres of rooms, colonnades, and gardens packed around…
Mongolia · Zone
Orkhon Valley
The cradle of Mongolian and Central Asian nomadic civilization and the location of the largest empire capital ever…
Mongolia · Zone
Orkhon Valley Cultural Landscape – Heartland of Eurasian Empires
For over two millennia, the Orkhon valley in central Mongolia served as the symbolic and political heart of…
Lazio · Area
Ostia Antica Archaeological Park
The ancient Roman port city near the Tiber's mouth, now an expansive 150-hectare archaeological park revealing imperial trade…
Kazakhstan · Zone
Otrar — Farab
The Silk Road frontier city where, in 1218 AD, the execution of a Mongol trade caravan triggered Genghis…
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