Despite its grandiose name, this enigmatic first-century void under the town is no cave, and it's possibly not a palace either.

A shrine-like museum entirely dedicated to soccer superstar Cristiano Ronaldo.

An officers prison camp believed to be impregnable by the Germans saw over 30 successful escapes.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

The world's most active stratovolcano is almost always erupting.

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

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

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

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

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

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

An Italian hillside ghost town.

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

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

Renaissance villa and gardens complete with a tormented colossus.

Geothermal waterfalls in Tuscany.

Stalactites and stalagmites in a beautifully lit cave.

The middle finger of modernity.

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

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

It’s said this crypt was the setting for the tragic finale of the Shakespeare play.