The sunken structure looks like the victim of a catastrophic flood.

The deserted pirate-themed restaurant still entices explorers.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

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

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

Since ancient times these picturesque springs have been providing bathers with healing waters.

A self-built mosaic house and sculpture park.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

An aluminum skeleton brings Chinese mythology to the French shore.

These quaint French houses dangle precariously over a precipice.

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

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

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

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

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

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

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.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

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

One of the greatest maze designer’s greatest mazes.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.