The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

Beautiful carved tunnels.

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

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

Monsters and miniatures are held in equal esteem at this wondrous museum.

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

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

A Gothic cathedral created from volcanic rocks.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

An icy lake tucked among jaw-dropping alpine panoramas.

The largest underground church in Europe.

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

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

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

One of the greatest maze designer’s greatest mazes.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

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

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

A museum of magic with a Sadist past.

A haunting collection of the vanished and disappearing natural world.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.