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

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

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

These spooky and unusual stone formations create an underworldly landscape.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

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

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

The great Danube river starts here.

A stunning two-story timepiece within a medieval Brick Gothic church.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

Crop circles inspired this whimsical garden in Germany.

An ancient pagan site swirling with legends in the foothills of Franconian Switzerland.

A 12th-century fortress containing some of Berlin's oldest buildings.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

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

Virgil's many-mouthed gateway to the underworld.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Five candy-colored villages on the Italian Riviera.

Stalactites and stalagmites in a beautifully lit cave.

An alchemist's "magic door" stands in the middle of a Roman park.

At this cemetery, artists are invited to design their own gravestones.