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

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

A sculpture serving as an homage to Pope John Paul II.

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

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

These spartan apartments are provided to clergymen visiting Vatican City.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

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

Medieval streets buried beneath a papal fortress now form an underground city you can walk through.

Medieval torture techniques with a modern conscience.

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

One of the largest squares in Europe contains an entire artificial island.

The oldest botanical garden in the world that technically isn't the oldest.

This old medieval prison tower has been a site of astronomical research for more than 250 years.

Venice's island of the dead.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

An iron dragon with a long neck covered in feathery scales perched above one of Venice's most popular squares.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

The only museum with its curator—and her pets—buried inside.

Where Venice's gondolas go for a tune-up.

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