Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

Legend has it fairies gathered at the site of this medieval castle.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

The idyllic island where the philosopher Jean-Jacques Rousseau spent “the happiest time of his life.”

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

These spooky and unusual stone formations create an underworldly landscape.

Caves famous for the dragon-slaying saint who lived there.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.

Walk inside a half mile long crevice right outside the town of Garmisch Partenkirchen.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.