Saturno Cave (Cueva Saturno), the star feature of a complex cave system. This hauntingly beautiful cenote or subterranean swimming hole offers a refreshing respite from the sun-baked beach. Stalactites drip from the roof of the cave, and stalagmites rise from the water's depths. Tourists come here to swim in the pool's azure-hued freshwater, dive off the crystallized columns, and admire the impressive rock formations.