America's most famous piece of self-built architecture.

The legendary building that needed ghostly approval before being built.

Gargoyle head that brings good luck.

Stone pillars and a petrified wedding party in the hills of North Macedonia.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

Space-age monument to an early 20th-century uprising.

The world's most elegant power lines.

Giant topiary dog once played a role in a terrorist bomb plot.

Haunting monument to the German Jewish philosopher who died while fleeing fascism.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

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.