A Nesting Doll of Churches.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Virgil's many-mouthed gateway to the underworld.

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

A fairy tale castle in modern Rome.

Architectural monsters are devouring this palace's every door and window.

Go inside to really appreciate this 500-year-old technological masterpiece.

The final resting place of the poets Shelley and Keats.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

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

2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The underground sanctuary of a mysterious ancient cult.

The glowing blue Nymphaeum of Emperor Tiberius.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Geothermal waterfalls in Tuscany.

The middle finger of modernity.

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

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.