The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

A wunderkammer of curious objects and intriguing art nestled within a hub of ancient Roman sites.

Geometry and mystery come together in an epic show of octagonal masonry.

Southern Italy's spinning top village.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This semi-secret storybook hedge maze is also the oldest garden in the city.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Super-heavy Nazi architectural experiment.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

This spooky statue sits outside a famous Prague theater.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Where once there was a train station bathroom, there is now this German burger joint.

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

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

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

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.