These once housed the families who decided in 1665 to quarantine themselves to save their neighbours.

Legend has it the famous Robin Hood would attend mass at this 12th-century Cistercian abbey in Sherwood Forrest.

A mammoth WWII anti-air defense tower has been repurposed as a hotel with a rooftop garden.

Check the time in 145 countries at once with this East German relic.

A never-finished memorial to the heroes of the Napoleonic War has become "Scotland's Folly."

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

A rococo room covered entirely in porcelain originally constructed for another royal residence.

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

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

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

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

Richard Luke Concanen never set foot on American soil.

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

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

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

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

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.

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

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