France, Lozere, Meyruis, Cevennes National Park, Aven Armand subterranean cavern near Meyruis, First explored in 1897 by Louis Armand and Edouard-Alfred Martel, Original access through 75M pit, now via inclined cable car, Main chamber 'Grand Salle' 100m by 55m and covered in Speleothems; Stalagmites; Stalactites;