This ancient Spanish castle sits high upon a hilltop.

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

Rare karst landscape eroded from a flat seabed.

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

Abandoned waterpark turned counter-culture mecca.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

A charming Spanish village sits atop this natural limestone overpass.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

"Alleys of Stone" form natural mazes in Spanish natural park.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

Moorish signal station on a stratgic rocky outcrop.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

A once-secret library of Freemason history in Catalonia.

The earliest known map to show America, discovered by accident at a Paris bookshop.

A Romanesque tower appears when water levels drop.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

Of course Salvador Dalí lived in a castle...

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.