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

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

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

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

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

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

Village situated on a narrow volcanic escarpment.

A Romanesque tower appears when water levels drop.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

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