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

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

The history of radiation is on safe display at the foot of a radiation science laboratory.

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

One of the oldest medical collections in Europe focusing on rare surgical instruments.

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

A font of vintage porn on the silver screen.

France's national museum of scientific and industrial instruments.

The largest earthwork effigy in the world.

One of the oldest masonic museums in Paris.

Native Americans built this circle of stones, which was used to predict astronomical events.

An extensive collection of ancient Egyptian artifacts and mummies.

A snapshot of the city's fascinating voodoo culture.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

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

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