Paris' linguistic guide to the international language of, yes, love.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

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

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

Berlin's old airport.

Where once there was a train station bathroom, there is now this German burger joint.

Started as a kitchen garden, now the second largest botanical garden in the world.

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

This abandoned Belgian fortress is purposefully being left to nature.

Climb inside an iron crystal magnified 165 billion times its normal size.

This modern arts center is built around a gem of late-Baroque architecture.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Concrete strongholds stand guard over the Golden Gate.

An enormous illuminated figure dances on the Las Vegas strip.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

A winding path built in secret on the edge of the continent.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.