Photo Gallery: Mexico's Mysterious Cenotes
11/30/2012

The cenotes on Mexico's Yucatan Peninsula were created when the ceilings of limestone caves collapse. Some of the holes fill up with rainwater, while others reach down to the water table and are connected to giant cave labyrinths. In the Stone Age, many of the caves, which were dry at the time, were used as living quarters and burial sites. The Mayans later worshipped the cenotes as gateways to the underworld Xibalba ("Place of Fear").