An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

Venice's island of the dead.

This half-finished "city of toys" was almost Italy's own Las Vegas.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

An ancient artistic garden parlor full of hidden water wonders.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

The Pope’s secret escape route.

Crushed coral and crystals give the sand its signature coloration.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

Virgil's many-mouthed gateway to the underworld.

A sunken idol welcomes parishioners to Davy Jones' Locker.

The remains of a town so thoroughly destroyed by French forces that the citizens simply left.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

This medieval Italian town is a sheer (and beautiful) cliffside defense.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

The location of the last witch trials of Italy, known as "The Salem of Europe."

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

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

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.