This Luxembourg cave is covered in cryptic looking marks left by mining activity.

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

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

The history of German architecture is explored across this fairy-scale mini-city.

What was once thought to be a wellspring of unicorn bones is actually just a prehistoric burial site.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

A monument to the "father of modern warfare" Gustav II Adolf.

Centuries of warfare, tragedy, executions, and poetry come together in this 13th-century fortress.

This splendid tomb may look fantastic, but there's nothing in it...

German and American troops joined forces to defend this fortress during the strangest battle of World War II.

Where beer lovers can literally immerse themselves in beer.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This German museum is devoted to all aspects of grave culture from headstones to coffins.

A modern museum dedicated to the fairytales and dictionary work of the Brothers Grimm.

A Neolithic celestial calendar standing in a nondescript wheat field.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

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

Enter the cabin of a life-sized Hindenburg replica.

A unique bridge with an equally unique view.