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

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

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

Virgil's many-mouthed gateway to the underworld.

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

The oldest operating pharmacy in the world features 800-year-old recipes.

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

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.

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

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

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

The glowing blue Nymphaeum of Emperor Tiberius.

Geothermal waterfalls in Tuscany.

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

The middle finger of modernity.

Stalactites and stalagmites in a beautifully lit cave.

Pompeii's less famous neighbor is still revealing her secrets.

An alchemist's "magic door" stands in the middle of a Roman park.

Thousands of well-dressed mummies below a monastery.

A submerged archeological park still holds the wonders of a Roman Sodom.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A small village in India bears witness to the end of birds' lives every September.

A complex of six forts embedded in the Rajasthan hills.