A place to see how French aristocrats lived in the early 1900s.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

French commune at the heart of conspiracies.

Perfume museum and library.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

To the famous surrealist artist, liberty required two torches held high.

This army of concretions is an unexplained geological phenomenon unlike anything else in the world.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

Series of underground houses inhabited continuously for centuries.

A remote hilltop covered in giant monoliths haunts the Brittany countryside.

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

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

An architectural oddity of six stories, accessed by graceful ramps.

The storefront of a ramshackle Parisian puppet theater.

This hidden garden boasts amazing views of Lyon.

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

Figures of unknown origin carved into the surfaces of underground caves.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

One of the world's most complex timepieces.

An atmospheric, medieval-themed book store hides in a 13th-century underground space.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

100-windowed castle turned art gallery, built by one dedicated mason.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

Tens of thousands of ancient rock carvings hidden in the heart of a French national park.