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

Apartment complexes built into huge repurposed natural gas tanks.

The final resting place for the remains of 143 Habsburg royalty.

The beautiful baroque library of the Hapsburg empire.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The world's oldest bookshop still in operation.

A relic of Victorian grandeur hides beneath a busy South London road.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

Home of the Large Hadron Collider and the birthplace of the World Wide Web.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

A constellation of golden cobblestones shows the names of local children born under a full moon.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

Meet the bronze beloved pet to a family of famous peeing statues.

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

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

A set of seven houses, each built in a style that represents a European country.

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

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

Enter the cabin of a life-sized Hindenburg replica.

A lakeside footbridge that records Nobel Prize laureates' names in metal silhouette.

This museum tells the story of lake dwellers from 4000 BC to 850 BC, replete with stilt houses and goats.