The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

The abandoned ruins of a failed resort hide on this verdant, picture-perfect island.

The tallest statue in Italy is also one of the world's tallest statues of Jesus.

An omelette made with over 1,000 eggs may have been prepared when Holy Roman Emperor Charles V visited this monastery.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

Ride a boat through this magnificent underground world, which now doubles as a theater.

This medieval hilltop village was abandoned at the end of the 19th century, after existing for more than 500 years.

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

This stretch of the ancient Roman road is preserved in a valley that witnessed many battles and legendary highwaymen.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

A founding document of the European Union was written on an island where Roman emperors once banished women.

Built to be the ideal penitentiary, this abandoned panopticon saw several revolts and even a prisoners' coup.

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

The glowing blue Nymphaeum of Emperor Tiberius.

This tiny islet has somehow housed an ancient temple, two monasteries, a church, a fortress, and a restaurant.

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

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

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.

The oldest volcanology research center in the world.

Before the more famous Royal Palace of Caserta, the king of Naples first commissioned this overlooked residence.

The first Italian factory to produce locomotives is now a marvelous museum.

This medieval city gate is now a blend of the past and the modern world.

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

The relics of dozens of martyrs are stored in a single chapel.