Climb right into the heart of this colorful Iceland volcano.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

This automated sculpture of two men peeing will spell out text messages with their micturition.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

The hidden lair of an alchemist rediscovered in a 2002 flood.

This doorless 20th-century elevator doesn't stop or slow down.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

The Devil’s own choice when he needs a drink in Brussels.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

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

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

Got apples?

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

This banal Parisian entranceway is not what it seems.

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

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

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

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

This Parisian fountain is a little bit fantasy and a little bit nightclub.