Two small chapels housed inside an ancient tree.

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

These quaint French houses dangle precariously over a precipice.

Got apples?

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

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

BDSM, 1930s Style.

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

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

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

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

The famous winding walk at Chartres is surrounded in mystery and myth.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

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

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

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

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

This massive blockhead sculpture hides an entire library.

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

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

A Gothic cathedral created from volcanic rocks.

Historic medieval fortified city in southwest France.

The largest underground church in Europe.