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

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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

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

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.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

Hundreds of hidden passageways weave through the old quarters of Lyon.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

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

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Indents in the pavement are all that remain from a grisly death machine in Paris.

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

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Notorious artist squat renovated into legal studios.

France's most famous cemetery, with some of its most curious tombs.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.