A curious collection of locks and keys.

A charming flea market shop dedicated to retrofuturistic apparati.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

The heaviest gold coin ever minted.

This mural painted by Keith Haring was done without payment as a gift to entertain the children at the Hôpital Necker.

The video game-themed street art first popped up in the French city.

The final resting place of the "father of special effects."

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The Sun King's military models, saved from the Louvre.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

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

The curious underground history of keeping Paris clean.

Statue of death tucked in the University of Medicine courtyard.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

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

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

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

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.

This series of Scottish caves has no clear purpose other than baffling historians.