Virgil's many-mouthed gateway to the underworld.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

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.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

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

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

This Italian foot path winds through the mountains via 52 individual tunnels.

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

This delightful little museum is dedicated to only one thing: pasta.

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

One of seven Jewish catacombs in Rome and one of only two open to the public.

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

A Milanese café entirely designed by the American director Wes Anderson.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

The Pope’s secret escape route.

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

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

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

The plague quarantine island home to the alleged "Vampire of Venice."

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

A Nesting Doll of Churches.

Crushed coral and crystals give the sand its signature coloration.