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

Berlin's old airport.

A 12th-century fortress containing some of Berlin's oldest buildings.

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

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

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

Art and a pun, all in one.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

An eerie, derelict amusement park in Berlin.

A slice of central Asia in the middle of Berlin.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

A forgotten "city of water" underneath the famous Trevi district.

2300-year-old Roman road connecting the empire.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

This hermitage celebrates the legend of Emperor Constantine's healing from leprosy.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

The ruins of an abbey believed to have been founded by Charlemagne in the 9th century.

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

A huge enchanting public park just outside the ancient walls of Rome.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.