Of course Salvador Dalí lived in a castle...

A science fiction-inspired apartment building designed by a famous Spanish architect.

A charming Spanish village sits atop this natural limestone overpass.

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

Stunning Roman aqueduct used for 1900 years and still standing.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

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

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

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

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

One of Europe's largest supercomputers is housed inside of a disused chapel.

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

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

Wonderland replication in progress by one persistent man.

A lush indoor jungle fills this bustling Madrid transportation hub.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

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

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

A beautiful but toxic fountain of mercury.

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

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