This French "sea of rocks" is packed with stunning rock formations and its own medieval castle.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

Fighting the British and making game shows for over 150 years.

Artist's eccentric property excessively decorated with found objects and work of his own.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

Resting on a hill overlooking the coast, these medieval ruins look completely deserted save for their restored chapel.

One man's desire to transcend art led to the construction of this outsider chapel.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

Walk through living pictures and music in the Cathedral of Images.

An enchanting work of outsider art, full of whimsical sculptures and carvings.

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

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

A sanctuary for wolves in a community which once trembled in fear of the murderous "Beast of Gévaudan."

Series of underground houses inhabited continuously for centuries.

The world's most famous cheese caves.

This otherworldly French waterfall looks like its waters have turned to stone.

Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

A French library that makes sure its love of books is writ large... giant in fact.

This ancient theater was once the home of fierce gladiatorial battles.

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.