This natural hill rose another 130 feet from the debris and rubble added after World War II.

World's largest barrel containing an inn.

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

This unique medieval artwork featuring the story of the Antichrist remained lost for decades.

Remnants of a cone-shaped Nazi bomb shelter.

A series of haunting wooden totems are hidden in the woods surrounding a German environmental center.

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

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

An old slaughterhouse now holds the largest collection of pig artifacts.

It's good luck to be mocked by this monkey.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

The stones of this formerly witch-obsessed castle were used to build a church.

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

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

Remains of a huge radio tower.

Lavish royal estate punctuated with heated greenhouses.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

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

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.