This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Thousands of flowers create enchanting pink tunnels over the city streets.

Three columns of volcanic rock shoot out of the ocean.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This stunning concert hall has become a symbol of Iceland's national recovery.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

The world's oldest known salt mine.

An Austrian house of bones filled with hundreds of intricately painted skulls.

A church of bones, decorated with 40,000 human skeletons.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

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

A surreal statue honoring Prague's favorite literary son.

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

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

A subterranean playground in an abandoned slate mine.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

How did a French journalist’s grave become the sexiest statue in the cemetery?

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

One of downtown Berlin's last reminders of its Communist past.