Thousands of artifacts relating to human sexuality, including the world's largest sex bike.

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

A completely underwater art museum sends a stark message about humans' impact on the environment.

Of course Salvador Dalí lived in a castle...

An architect transformed this abandoned cement factory into his castle-like workshop.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

Village situated on a narrow volcanic escarpment.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

This house's itty bitty size means no humans allowed.

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

A Spanish town built into the cliffs.

An isolated village literally built into the crevices and rock formations of a mountain.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Wonderland replication in progress by one persistent man.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This semi-secret storybook hedge maze is also the oldest garden in the city.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

The World's Largest Bull.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.