The glowing blue Nymphaeum of Emperor Tiberius.

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

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

A fairy tale castle in modern Rome.

Thousands of well-dressed mummies below a monastery.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

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

The final resting place of the poets Shelley and Keats.

2300-year-old Roman road connecting the empire.

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

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.

Architectureal fantasy quarter of Rome.

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

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

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

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

This 17th-century passageway is home to numerous bookshops, a witch legend, and the oldest pizzeria in the world.

This monumental fountain has moved around the city multiple times.

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

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

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

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