Category:Subterranea
Appearance
- 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.
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Subcategories
This category has the following 3 subcategories, out of 3 total.