The largest cistern in Albaicín is Aljibe del Rey. The Grand Well of Alcazaba was built during the 11th century. It had a capacity of over 79,250 gallons of water. What makes this equally exciting is the informative Water Interpretation Center managed by the AguaGranada Foundation. You will be amazed while walking through the ancient storage chambers and learning about the ingenious water supply and irrigation system engineered by the Muslims.