This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

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

This large, circular tomb is the final resting place of the first emperor of Rome.

A formerly opulent Italian village is now a crumbling ghost town that no one really knows what to do with.

Eighteen mummies have stood guard behind the altar of this tiny church since 1833.

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."

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

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

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

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

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

An Italian hillside ghost town.

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

Thousands of well-dressed mummies below a monastery.

Architectureal fantasy quarter of Rome.

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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This Neolithic passage tomb forms part of a World Heritage Site.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

This 5,300-year-old tomb with mysterious carvings crowns an Irish mountain.