A Spanish artist builds his own castle.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

A medieval village holds a very modern hotel.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

A darkly erotic open-air statuary in Catalonia.

Abandoned waterpark turned counter-culture mecca.

The oldest Roman lighthouse still in use.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

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

Rare karst landscape eroded from a flat seabed.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

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

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

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

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

Stunning Roman aqueduct used for 1900 years and still standing.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

Village situated on a narrow volcanic escarpment.

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

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

The final resting place of the great navigator, or maybe his brother.