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

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

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

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

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

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

David Sedaris called it "The greatest shop in the world."

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

Pilgrimage site for star-crossed lovers.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

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

Abandoned medieval hill town.

Ruins of a 10th century church tucked away deep in a botanical garden.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

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

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

The glowing blue Nymphaeum of Emperor Tiberius.

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

Geothermal waterfalls in Tuscany.

Stalactites and stalagmites in a beautifully lit cave.

Renaissance villa and gardens complete with a tormented colossus.