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

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

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

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

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

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A floating cat sanctuary on an Amsterdam canal.

Putt your way around Australia in a black light environment.

You'll find the little birds tucked within the rocks of this Australian beach.

The tallest sea cliffs on the Southern Hemisphere are a climber's worst nightmare.

This extraordinary geological oddity resembles human-made pavement.

Woven tree art gives this towering Australian woodland a touch of mystical whimsy.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

Once an imperial lake garden, anyone can now visit this city park.

On special occasions, one of the world's tallest artificial waterfalls gushes down the side of this Chinese skyscraper.

Though these human-made islands were constructed as an escape for the wealthy, they rarely see many visitors.

A prestigious learning institute of old Shanghai.

Home to around 40 different species, this forest was also the setting for "Crouching Tiger, Hidden Dragon."

Two nearly identical Chinese pagodas stand side by side, along with ancient stone relics.

Inside this museum is an ongoing excavation of an ancient shipwreck.