This abandoned Slovenian military barracks has become a punky-political art squat.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Baroque celebration of the end of the Great Plague of Vienna.

Op-art architecture designed for happiness.

Dine amidst exotic plants at this former royal greenhouse.

The topiary maze at the Habsburg hunting lodge.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

This spooky statue sits outside a famous Prague theater.

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

An eerie, existential museum dedicated to the author of "The Metamorphosis."

The first museum in the world devoted to sexual gadgetry.

Macabre astrological automaton clock dating to the late 1400s.

A tribute shrine where the Space Invasion street art movement started.

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

This Parisian gem is one of the most incredible ethnographic museums in the world.

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

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

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

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