Khara-Khoto, also called Khar khot (meaning “black city” in Mongolian) is a ruined fortified city near the Juyan Lake Basin in the far west of Inner Mongolia, China.
Archaeologists conducting excavations of the fortified Ancient Egyptian city of Berenike suggest that drought caused by volcanic eruption led to the city’s abandonment.
Çatalhöyük is an ancient proto city from the Neolithic and Chalcolithic periods, located on the edge of the Konya Plain near the present-day city of Konya in Turkey.
The Führerbunker was a subterranean bunker complex in Berlin, Germany, that served as Hitler's final Führer Headquarters in the last months of the Second World War.
The West Norwood Catacombs is a network of subterranean vaults and passages for the burial of human remains beneath West Norwood Cemetery, in London, England.