Rome's semi-secret peephole vista is also a former Crusader stronghold.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The Pope’s secret escape route.

Breathtaking and huge 430 year old maps of Italy.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

A Nesting Doll of Churches.

2300-year-old Roman road connecting the empire.

Jesus' footprints and the first catacombs in the world.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

100 year tradition of fist fights, marked by marble footsteps.

Go inside to really appreciate this 500-year-old technological masterpiece.

Macabre astrological automaton clock dating to the late 1400s.

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

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

A 12th-century Italian skirmish gets reenacted with 500,000 pounds of flying citrus.