The underground sanctuary of a mysterious ancient Roman religious cult contains an exquisite traditional fresco.

Nobles would stage mock naval battles on this large lake at the Royal Palace of Caserta.

The old church, buried by the 1784 Mount Vesuvius eruption, is a remarkably well-preserved place where people now pray for the souls of the dead.

The oldest volcanology research center in the world.

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

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

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

An unusual "skull with ears" sits in the crypt of this small church tucked away at the end of a narrow alley.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Does this church in Naples hold the true tomb of Vlad the Impaler, the notoriously cruel figure who inspired Bram Stoker's Dracula?

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

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

A special area of the National Archaeological Museum of Naples is located inside a metro station.

A Greek tomb discovered under a palace in Naples displays ornate funeral decorations.

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

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

This monumental fountain has moved around the city multiple times.

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

These bronze horses on the gates of the Royal Palace of Naples were a gift from a Russian tsar.

This whimsical fountain depicts a winged siren shooting water out of her nipples into the fires of Mount Vesuvius.

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

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

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