This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

Longest canal tunnel in the world, abandoned in the 1960s.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

Site of one of World War I's most horrific scenes.

An unsettling shrine dedicated to the ravenous beast that prowled 18th-century France.

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

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

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

This little-known relic crypt holds stolen parts of a Roman Empress.

This banal Parisian entranceway is not what it seems.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

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

Science fiction's grandfather has a fittingly marvelous tomb.

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

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

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

Paris' fabled purveyor of exotic taxidermy and natural history curios.

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

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

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

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.