A collection of collections, including an anatomy museum, the “Cabinet of Physics of Alessandro Volta, a museum of natural history, mineral collection, and much much more...

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

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

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

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

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

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

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

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

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

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

The final resting place of the poets Shelley and Keats.

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

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

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

Renaissance villa and gardens complete with a tormented colossus.

Architectureal fantasy quarter of Rome.

Thousands of well-dressed mummies below a monastery.

A submerged archeological park still holds the wonders of a Roman Sodom.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

The middle finger of modernity.

The largest and most famous wax anatomical collection anywhere in the world.

The oldest operating pharmacy in the world features 800-year-old recipes.

This museum is rotten with a century of wax medical deformities.