THE REMOUCHAMPS CAVES, BELGIUM
These caves contain the longest subterranean river known in the world, the Rubicon (not to be confused with the Rubicon in Italy). The caves opened in 1912 and were originally equipped with torches. 8,000 years ago Paleolithic hunters sheltered themselves in the caves; much later the same area was used as a wine shelter. More recently the caves were used as a shelter during World War II. <!-- more --<
Bats can be seen within the cave, as can the niphargus, a blind, translucent shrimp. There are also many stalactites and stalagmites within the passageways; one is thought to resemble the Virgin Mary.
To explore the caves, visitors first take a long walk to a ‘cathedral’ and then take an hour and a half boat ride for 600 metres down the Rubicon.
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http://www.atlasobscura.com/places/caves-remouchamps Image: Pahles at li.wikipedia
