Wander among the abandoned ruins of this once-powerful medieval town.

Italian cave with exceptional acoustics and an unsavory history.

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

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

A huge enchanting public park just outside the ancient walls of Rome.

A little-known museum of Ancient Roman and Ancient Greek artifacts.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

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

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

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

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

The world's most active stratovolcano is almost always erupting.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Cave shrine on Monte Pellegrino.

Thousands of well-dressed mummies below a monastery.

A resort destroyed by a mysterious bombing offers visitors only its remains and the riddle behind it's demise.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.