Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This picturesque archeological site looks like it was pulled straight from a fantasy novel.

A mythical garden that once grew the golden apples of wisdom is said to have existed in this ancient Moroccan city.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This shell of a historic manor house on the Isle of Wight is said to be the most haunted site on the island.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

A Moroccan getaway in the mountain range that plays the Himalayas' stunt double.

Founded as a refugee camp, now a popular tourist spot.

Wondrous stalactites house thousands of bats in these African caves.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The fairy tale castle of the "fairy-tale king."

One part local history, 99 parts gruesome haunted house.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.