We also visited another cave, a very different kind of cave, the Gouffre de Padirac (Padirac Chasm), located near Gramat.
The chasm was created when the roof collapsed into a large internal cavern. Apparently the cavern existed in the 3rd century and was inhabited during the 15th and 16th centuries. The cavern contains a subterranean river that is partly navigable by gondola. (The cavern system is made up of more than 25 miles of galleries but only a bit over a mile is open to visitors.)
It felt a bit like a Disneyland ride, and I was expecting to hear "It's a Small World After All" at any moment. But the views down there are unique. The water is crystal clear and there are stalactites and stalagmites everywhere as well as various rock formations, including the one they call the Pile of Dishes, shown here.