Street artists transformed an abandoned air vent into the beloved Star Wars robot.

Dedicated to the man who saved hundreds of children from Nazi-occupied Czechoslovakia.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

This artificial cave looks like something out of a fairytale.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

A Baroque mansion with ties to legendary magicians and alchemists.

A series of playful yellow penguins share a serious message about the environment.

This doorless 20th-century elevator doesn't stop or slow down.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

A Jenga-style cylindrical tower of books that appears to go on forever.

Countless grotesque faces stare out from this eerie Prague art wall.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Walk through Czech history in Prague's largest graveyard.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

One of the greatest maze designer’s greatest mazes.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

Fabulous formations, weird and wonderful wildlife.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

This isolated island is often capped by its own fluffy cloud.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.