An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

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

A dilapidated psychiatric facility on the outskirts of Milan where electroconvulsive therapy was developed and Napoleon once lived.

An unsettling painting of three faceless sisters that is surrounded by history and legend.

This trail was once used to smuggle cigarettes, sugar, and other black market goods between Italy and Switzerland.

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

Leveled by an earthquake, this Italian village is now preserved as a massive concrete art project.

A never-inhabited village that was built as part of Mussolini's agricultural reforms.

This amazingly preserved Doric temple was abandoned before it was ever completed.

A madman's personal garden filled with 1,000 sculpted heads.

A petite white lighthouse perched on the ancient core of Stromboli Volcano.

Stalactites and stalagmites in a beautifully lit cave.

Abandoned village in Sicily built during the agricultural reforms of Mussolini.

Gorgeous views of Italian mountains and valleys form the backdrop of this unique open-air theater.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

This uncanny fresco celebrating the "triumph of death" was split into four pieces to be moved to another museum.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Thousands of well-dressed mummies below a monastery.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

Cliffs full of fossils at the portal to England's Jurassic Coast.

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

The 14th-century ruins are said to contain healing powers.