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Subterranea (geography) 
Summary
Subterranea are underground structures, both natural (such as caves) and human-made (such as mines).[1]
Some subterranea and related topics include:
Natural edit
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- Borehole
- Bunker
- Burial vault (tomb)
- Casemate
- Catacombs
- Cave dweller, Underground living
- Cave temple
- Cellar
- Dungeon
- Dugout (shelter)
- Fogou
- Hypogeum
- Mine
- Rock cut architecture, rock-cut tomb
- Smuggling tunnel
- Tunnels (street tunnel, train tunnels)
- Underground city, umbrella article for underground dwellings and facilities
- Underground rapid transit system
- Wine cave
See also edit
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