The red letters in the literary pavement leading to the library form a mysterious code.

Order a salt beef-loaded beigel at any hour of the day or night at this East End institution.

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

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

The first Italian factory to produce locomotives is now a marvelous museum.

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

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

The walls and streets of the ancient city are peppered with penises.

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.

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

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

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

This Neapolitan exhibition hall grants weird and wonderful insight into the intricacies of human biology.

This monumental fountain has moved around the city multiple times.

An elegant church is home to a remarkably detailed mosaic floor depicting the Garden of Eden.

The enchanting home of an eccentric Swedish physicist and author sits in the hills of Anacapri.

Locals pay their respects at a shrine to soccer player Diego Maradona—which claims to contain a real lock of his hair.

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

Richard Luke Concanen never set foot on American soil.

The sacristy of this church contains remains and relics of members of the Aragonese royal family.