This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

A room filled with frescos that make it seem like the walls are crumbling down while giants die in despair.

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

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

This is the oldest Roman-made bridge in the city still existing in its original state.

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

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

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

This curious, round temple is the oldest still-standing marble building in Rome.

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

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

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

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

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

One of the highest mountain passes in Europe has been ranked among the best driving roads in the world.

The sunlight passing through the opening of this huge cave system creates a magical effect.

The mountaintop inspiration for Umberto Eco's "The Name of the Rose."

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

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

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.