The relics of dozens of martyrs are stored in a single chapel.

This overgrown mountain village has been abandoned for nearly a century.

Meet the oldest inhabitants of this Italian hamlet, a series of oddly preserved mummies.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

This magical-looking island is notorious for the misfortunes suffered by its owners.

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

Renaissance villa and gardens complete with a tormented colossus.

This uniquely designed bridge served as the city gate for Comacchio.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

This natural gas vent certainly earns its name as the smallest volcano in Italy.

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

An amazing collection of wax anatomical models and terratological models.

An extraordinary collection of 18th century anatomical waxworks.

The jaw of one of humankind's earliest ancestors on display at an overlooked geology museum.

A preserved college lock-up that recalls a clubhouse approach to discipline.

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

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

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

The skulls and bones of thousands of soldiers line the walls of this small Italian chapel.

On the shores of Lake Garda, the ruins of a Roman villa that allegedly belonged to the poet Catullus.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.