Whimsical sculptures and caves chiseled by nature over the millennia.

An abandoned airport in the middle of nowhere.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

The largest medieval water tank on the Iberian Peninsula is preserved beneath the Cáceres Museum.

An abandoned socialist utopia built in the late 19th century.

Rumors and legends of secret Nazi activities surround this eerily remote island mansion.

A historic Christian shrine nestled within a spectacular natural cave.

Translating as "The Jump of the Girlfriend," this stunning waterfall has a tragic legend behind it.

Volcanic rocks ground down into sand make this Spanish beach as black as night.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

This abandoned naval battery stood at the ready as recently as the 1980s.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

A Spanish artist builds his own castle.

This century-old ruined temple was reborn as "The Church of Skate."

This ancient Spanish castle sits high upon a hilltop.

The oldest Roman lighthouse still in use.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

A charming Spanish village sits atop this natural limestone overpass.

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