Legend has it this 11th-century castle was paid a visit from the devil.

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

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

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

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

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

Series of underground houses inhabited continuously for centuries.

Perfume museum and library.

French commune at the heart of conspiracies.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

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

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

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

France's high-tech, future-themed amusement park.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

An ancient ossuary in Rouen.

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

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

Green labyrinth formed by a karstic maze hidden in a preserved oak forest.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

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

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