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

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

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

A medieval military street hidden beneath a charming French fishing village.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

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

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.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

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

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

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

An icy lake tucked among jaw-dropping alpine panoramas.

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

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

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

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

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

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

Statue of death tucked in the University of Medicine courtyard.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

A museum of magic with a Sadist past.