Underground dwelling o/t Tuatha d Danaan or- "Children f Danu", mythological mother goddess o/t Irish Celts. Fairy folk like Leprechauns inhabit these places, particularly under th burial aka fairy mounds
La Tour Perce is a unique double arch and at 32 meters is the longest span in the Alps. The existence of this arch was only documented in Situated between Grenoble and Chambery (massif de la Chartreuse), Rhone Alps region, SE France.
Texas is blessed with some of the nations most interesting "show" caves and thousands of "wild" caves throughout the state. Because of the varying geographical regions and features of Texas, you could literally tour the entire state by jumping from cave