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.

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

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

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

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

One of the greatest maze designer’s greatest mazes.

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

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

A museum of magic with a Sadist past.

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

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

A museum of carnival attractions where you are invited to ride the rides.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

These ordinary blocks of stone are the last surviving remains of Tokyo's infamous red-light district.

Crawl through the hole in the middle of this stone to break off a bad relationship or initiate a good one.

An unexpected curiosity cabinet hidden within a department store in the Japan Post tower.

Go through the looking glass in Tokyo's Wonderland-themed shop.

Shrine to Japanese water-goblins, complete with their preserved body parts.

This subterranean spot might be the epitome of Japan's baroque, retro coffee houses.