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

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

Pompeii's less famous neighbor is still revealing her secrets.

This Roman amphitheatre was also the location of the first gladiator school.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

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

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.

Suffocating dogs was a common spectacle in the fumes of this noxious cave.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

An eerie, little-known Neapolitan museum filled with preserved human remains.

This magical-looking island is notorious for the misfortunes suffered by its owners.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

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