Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

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

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

This ancient market is often referred to as the oldest shopping mall in the world.

Its interior is adorned with some of the best examples of early Christian mosaics.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

The former home of an Italian artist is now a shrine to his ambitious works.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

This ancient Roman arch misled treasure hunters for centuries.

A quiet Sicilian village is home to a cafe that had an important role in "The Godfather."

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

The titular "little arch" near this Italian resort is one of the most popular diving spots in the country.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

This amazingly preserved Doric temple was abandoned before it was ever completed.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.