Located at the bottom of an abyss in Albania, the world's biggest underground thermal lake is a one-of-a-kind natural wonder ...

Underground chapels around the world each hold a distinct charm. Some of the most famous ones are located in the Wieliczka ...

in his description of the various phenomena of the subterranean world, has, without any such aid, succeeded admirably in conveying a vast amount of solid information, in so lucid and easy a style ...

There are tours of this subterranean world of upside-down, mostly of its defunct storefronts and long-abandoned toilets, but parts of this underground world is still thriving, and at the ...