Macabre astrological automaton clock dating to the late 1400s.

This spooky statue sits outside a famous Prague theater.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Inside this Krakow church, an explosion of psychedelic color.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

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

This Italian foot path winds through the mountains via 52 individual tunnels.

Italy's curious field of mud volcanoes is named for being both gross AND salty.

This lush, scenic spot was carved by the turquoise waters of the Radovna.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A shopping mall housed in a historic cinema and hiding ancient ruins under its floors.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A memorial dedicated to the 29,000 Istrian freedom fighters of World War II.

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

An Italian hillside ghost town.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

These abandoned salt flats are now a haven for wildlife.

These sea caves are the source of Xigia Beach's distinct aroma.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

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

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

One of the largest tuna factories in the Mediterranean now serves as a museum honoring Sicily's history of bluefin tuna hunting.