Since ancient times these picturesque springs have been providing bathers with healing waters.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

Beautiful carved tunnels.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

These quaint French houses dangle precariously over a precipice.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

The largest underground church in Europe.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.