Subterranea (geography)

Subterranea refers to underground structures, both natural (such as caves) and man-made (such as mines). Some subterranea include:

Bunker

Burial vault (tomb)

Casemate

Catacombs

Caves

Ice caves

Cave dweller, Underground living

Cave temple

Cellar

Cenote

Dungeon

Dugout (shelter)

Karst

Gallery

Lava tubes

Lunar lava tube

Rock cut architecture, rock grave

Smuggling tunnel

Subterranean rivers

Subterranean waterfalls

Tunnels (street tunnel, train tunnels)

Underground city

Underground lakes

Underground rapid transit systems

Volcanic pipes

Wine caves