The jewel of Granada is, without question or competition, the Alhambra. Perched high above the main city, the Alhambra is a sprawling fortress and palace, with walls, arches, and ceilings so intricately engineered and decorated, it could take endless visits to fully appreciate its beauty. The richness of its aesthetic appeal is equalled only by its history. Built as a fortress in the 9th century and expanded into a palace in the 11th century, it was the last Muslim stronghold in Spain until the Catholics took it in 1492. For a time, it was used by both Catholics and Muslims, however, that symbiosis was relatively short lived, lasting less than ten years.