Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

This former steel and coal plant is now a neon-lit industrial fantasia.

The great Danube river starts here.

A unique hanging cable-car navigates through Dresden, the oldest suspension railway in the world.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

These 18th century gardens tell a rocky story of the son of Odysseus.

This conical hill was built as a testing ground for an engineer known as the Glider King.

An elevator into the Baltic Sea.

The prototype for all Nazi concentration camps.

Floating swimming pool within a moored vessel.

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

This historic stone bridge has an entire neighborhood clinging to its sides.

A small but immensely extravagant palace built by the "Night King."

A stairway to heaven, or to nowhere at all.

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

"The most colorful grottoes of the world.

This "floating railway" is one of the world's oldest monorail systems.

A striking 12th-century-style castle built on the edge of a cliff.

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

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

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

Ruins of a German Castle on top of a towering stone pillar.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.