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

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

Pop culture has helped to keep this iconic British building from being destroyed.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

An unusual round church in London with a Templar past.

Eighty million natural history specimens call this gargantuan museum home.

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

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

A once-fairy tale mansion now stands in a state of disrepair.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

A perfectly preserved hill village where the buildings are painted like white lace.

A unique hotel for the artistic soul.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

A 141-foot wave of crashing lumber guards the entrance to the Grand Place in Mons.

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.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.