A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

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

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

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.

An eerie, derelict amusement park in Berlin.

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

Watch the local Netherlands birds from inside this giant eco-egg.

Four giant movable street lights decorate this modern Rotterdam square.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

Science meets wall art to highlight the beauty of famous mathematical equations.

The bridges portrayed on EU currency aren't fictional anymore.

This imposing tower named after the mythical sword of King Arthur is considered the tallest freestanding climbing wall in the world.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

Incredible labyrinth of man made caves.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

Yup, that's a 330-foot yacht passing over the highway.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

A beautiful maze marks where three countries meet.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

Peek through a transparent pyramid and drink in the mountain made of books.