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Subterranea are ''underground structures'', both natural (such as caves) and human-made (such as mines). Some subterranea and related topics include:


Natural


* Caves ** Cenote ** Ice cave ** Sea cave ** Sinkhole * Karst * Lava tube ** Lunar and Martian lava tubes * Subterranean river * Subterranean waterfall * Underground lake * Volcanic pipe


Human-made or related


* Borehole * Bunker * Burial vault (tomb) * Casemate * Catacombs * Cave dweller, Underground living * Cave temple * Cellar * Dungeon * Dugout (shelter) * Fogou * 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

* Seattle Underground * Subterranean London {{geo-term-stub