London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A modern-day Lascaux cave underneath Paris.

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

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

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

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

A font of vintage porn on the silver screen.

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

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

A unrivaled and rather horrifying collection of wax dermatological models.

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

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

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

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

A surrealist timepiece by the artist of melting clocks.

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

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

Experience architect Le Corbusier's modernist design for living in the home he designed for himself.

The curious underground history of keeping Paris clean.

The first green space constructed on an elevated viaduct.

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

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

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

France's national museum of scientific and industrial instruments.