High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

London's smallest police station is barely the size of a phone booth.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

Built in just a little over a week this preserved bunker was created to protect our most attractive POTUS while he was on vacation.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

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

A museum of carnival attractions where you are invited to ride the rides.

A garden of flying flowers.

This Belgian theme park began as a refuge for bored church children and was closed down when a boy lost an arm.

You would never come across this tiny green oasis if you didn't know it existed.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

This gruesome biblical parade celebrates the one day a year that a bit of Jesus' blood turns to liquid.

The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

Petting this mysterious iron monkey supposedly brings good luck.

The former home of a trailblazing surrealist is still filled with haunting dolls and grim paintings.

A visionary precursor to the Internet made of index cards.

Most prolific publishing house in the 1600s open to the public.

Only museum in the world devoted to bookbinding and book arts holds a permanent collection representing five centuries.

The highest point in Belgium is a staircase to nowhere.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.