An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

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

A surrealist timepiece by the artist of melting clocks.

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

The celebrated eyesore created by starry-eyed sweethearts.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

Notorious artist squat renovated into legal studios.

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

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

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

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The oldest stone house in Paris was built by its most famous alchemist.

This massive library holds what was once the largest book collection in the world.