César Baldaccini's iconic sculpture of a 40-foot thumb stands tall in La Défense.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

The Cimetière des Chiens et Autres Animaux Domestiques is one of the oldest pet cemeteries in the world.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The curious underground history of keeping Paris clean.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

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

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The personal library of the founder of modern neurology is open to visitors.

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

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

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

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

One of Jeff Koons’s largest sculptures and his first commemorative work.

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

This innocuous-seeming building is actually the remnant of a major wartime brothel.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

What looks like a normal building is really a hollow facade hiding a subway vent.

This bridge was constructed from the rubble of the infamous Bastille.

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