aljaferia palace in zaragoza, a medieval castle built in 11th during islamic domination of the spain

11th aljaferia ancient aragon arch architecture art attraction bastion brick building built castle city destination domination espana europe european exterior facade fort fortified fortress geometric heritage historic islam islamic landmark medieval military monument moorish moors mudejar muslim outdoor palace palacio reconquista ruins sightseeing spain spanish stronghold tourism tower travel unesco wall world zaragoza