This Arab fortress was once the largest citadel in Western Europe.

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

"Satisfying" is a good way to describe these beautifully aligned rows of Spanish mills.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A breathtaking and biodiverse wilderness in the mountain setting of Ernest Hemingway's "For Whom the Bell Tolls."

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

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

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

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

This ancient Spanish castle sits high upon a hilltop.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

A charming Spanish village sits atop this natural limestone overpass.

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

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

Village situated on a narrow volcanic escarpment.

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

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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