Cliffside houses provide a spectacular view from their perch above the valley.

Abandoned Nazi train station turned underground astroparticle laboratory.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Home to over 200,000 artifacts, this museum attempts to guide visitors through the ancient history of Beijing and Imperial China.

This probably wasn't what Mao had in mind.

Descend into the tunnels to experience the life of a coal miner.

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

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

Meet the bronze beloved pet to a family of famous peeing statues.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

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

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

The once highest point in China blends symbolic design with a kick of adrenaline.

A giant scale model giving a sneak peek at what urban planners see for Shanghai by 2020.

An out-of-place slice of France, smack in the middle of Shanghai.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

Five candy-colored villages on the Italian Riviera.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.