This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

This museum houses an imposing skeleton army comprised of creatures great and small.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Notorious artist squat renovated into legal studios.

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.

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

A Gothic cathedral created from volcanic rocks.

The largest underground church in Europe.

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

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

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

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.

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

One of the greatest maze designer’s greatest mazes.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The true depths of these stunning Moroccan caves are unknown.

This former royal palace with gorgeous gardens became the first museum in Morocco.

An abandoned horror film set sits eerily along a highway through Hollywood's "door to the desert."

A Moroccan getaway in the mountain range that plays the Himalayas' stunt double.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

Founded as a refugee camp, now a popular tourist spot.