Grottes de Bétharram Lourdes

Grottes de Bétharram is a network of subterranean caverns that has been carved out from the limestone, glittering with impressive formations of stalactites and stalagmites. Visits to the cave aboard a combination of minitrain and barge last around 1½ hours, but be warned: the site gets extremely busy in high summer. The site is along the D937, 14km west of Lourdes.