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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

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

The yawning maw of this pagan visage is said to bite off the hands of liars.

The hallucinogenic center of the ancient world.

For centuries, this large Roman villa remained hidden thanks to the eruption that buried nearby Pompeii and Herculaneum.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

The oldest volcanology research center in the world.

Buried next to Pompeii, this lesser-known Roman villa was the opulent vacation home of Emperor Nero's wife.

The walls and streets of the ancient city are peppered with penises.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

The ghost town where the villagers refuse to leave.

The Greek island's old British cemetery feels like a forgotten garden.

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

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

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

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

This colossal war machine is now a living museum dedicated to underwater warfare.