The world's first combination ski slope and power plant.

Visitors are treated to a stained glass kaleidoscope interior inside this work of art.

Amsterdam's Red Light District leaves little to the imagination.

Cat art as far as the eye can see.

A floating cat sanctuary on an Amsterdam canal.

The world's only museum devoted to the wonders of fluorescence.

Dozens of musicians have planted trees in this Danish park, and donated songs to go with them.

The world's largest maze is a nature park with nearly 200 decision points.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Sample Spanish wines under frescoes in a historic monastery of "barefoot old men."

Read a book with a glass of wine at this classically restored bar.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

This "flat geyser" bubbles up out of the ground periodically like a disappearing river.

A medieval village holds a very modern hotel.

This enchanting natural park is a magical example of a temperate rainforest in Europe.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

Volcanic rocks ground down into sand make this Spanish beach as black as night.