Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

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

An ancient monastery, a locked room, and a mysterious book heist.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

One woman's decades-long obsession with the "La Fée Verte."

Museum in a swimming pool where the water still flows.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Two small chapels housed inside an ancient tree.

Beautiful carved tunnels.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

This professional clown's home is an outsider art wonderland.

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

The famous winding walk at Chartres is surrounded in mystery and myth.

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

An aluminum skeleton brings Chinese mythology to the French shore.

This massive blockhead sculpture hides an entire library.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

Historic medieval fortified city in southwest France.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

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

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

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

Hundreds of hidden passageways weave through the old quarters of Lyon.