Walk through a fairytale in Tuscany.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

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

Medieval torture techniques with a modern conscience.

This half-finished "city of toys" was almost Italy's own Las Vegas.

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

One of the largest caves in the world open to the public.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

The astonishing collection of an infamous criminologist.

The giant skeleton sculpture is surprisingly well-traveled.

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

An ancient artistic garden parlor full of hidden water wonders.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

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.

The location of the last witch trials of Italy, known as "The Salem of Europe."

Virgil's many-mouthed gateway to the underworld.

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

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.

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.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.