Category:Subterranea
For more information, see Subterranea (geography).
Subterranea refers to underground structures, both natural (such as caves) and man-made (such as mines). Some subterranean features are secret places(see also Category:secret places); most, like road tunnels, subway systems and sewers, are parts of public infrastructure.
Subcategories
This category has the following 2 subcategories, out of 2 total.