2300-year-old Roman road connecting the empire.

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

The underground sanctuary of a mysterious ancient cult.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

An alchemist's "magic door" stands in the middle of a Roman park.

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

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

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

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

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

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

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

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

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

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

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

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

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

A plaque on the base of this statue holds a bewitching design.

Many famous English poets including Elizabeth Barrett Browning are laid to rest at this Swiss-owned cemetery in Florence.

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

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

An extraordinary house museum and cabinet of curiosities in the heart of Florence.