"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

A small Portuguese cottage formed between boulders in the countryside.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

A submerged village appears when dam levels drop.

A line of abandoned, alien-like fortresses dot the mountains of North Italy.

Crumbling ruins of the thermal baths that once attracted royals and aristocrats from throughout Europe.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

Europe’s oldest natural human mummy.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

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

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

The remains of a town so thoroughly destroyed by French forces that the citizens simply left.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

One of seven Jewish catacombs in Rome and one of only two open to the public.

The Pope’s secret escape route.

The plague quarantine island home to the alleged "Vampire of Venice."

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

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

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

Five candy-colored villages on the Italian Riviera.

An Italian hillside ghost town.