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

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

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This painted Lego bridge is the product of over a century of locomotive history.

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

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

No need to strap in for a "ride" on this walkable roller coaster.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

A stairway to heaven, or to nowhere at all.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

When the rain falls, this drain system turns into a musical instrument.

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

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

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

The fairy tale castle of the "fairy-tale king."

An eerie, derelict amusement park in Berlin.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

A spherical "micro-nation" in the heart of Vienna.

The topiary maze at the Habsburg hunting lodge.

This former insane asylum now holds a pathological anatomy museum.

A bike train runs along a disused railway line through the tranquil French countryside.

The world's tallest bridge is also possibly the most elegant.