The place where World War I began.

A war-torn Olympic relic is being overtaken by graffiti and nature.

A sculpture of the beloved author surrounded by characters from his fairy tales.

A public work of art that also provides some relief from the summer heat.

A whimsical bridge adorned with decorative dragons.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

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

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

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

A monument to the man who almost killed Hitler.

A restaurant and observation deck built in a unique broadcasting antenna.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

A beautifully eclectic mix of architectural styles.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

You feel like you're in a forest, but you're actually walking amidst the branches and trunks of a single giant tree.

World's largest open air theater spans 24 acres and hosts a massive recreation of the Passion of Christ.

A Tudor-style castle in Brazil holds one of the world's largest armory collections.