This is the perfect wet-weather attraction as the limestone caves are most beautiful when it rains. Discovered in 1939, the grotte is one of the largest in France with a dazzling array of stalactites and stalagmites. The adjacent archaeological museum, Cité de la Préhistoire, houses ancient artifacts that have been brought alive through child-friendly exhibits, 3D animations, and drawings by artist-cum-archaeologist Benoit Clarys. This imaginatively developed archaeological experience leaves visitors of all ages with palpable ideas of how prehistoric men lived in Paleolithic to Iron Age times.