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

This monumental fountain has moved around the city multiple times.

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

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

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

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

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

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

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

This uncanny fresco celebrating the "triumph of death" was split into four pieces to be moved to another museum.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

Haunting graffiti left by prisoners of the Spanish Inquisition.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

Every inch of this chapel is covered in craftsmanship from across the world.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

A British plaque explains that a house was built using the spoils of the first international golf bet.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Where America's first doomsday cult awaited the end of the world.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A 30-acre garden inspired by the principles of modern physics.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.