Hans Christoph Kappel / El Caracol observatory, Mayan Ruins, Chichen Itza, Yucatan, Mexico

John Downer / Sacred Cenote (limestone sinkhole) used by Mayans for human sacrifice, Chichen Itza, Yucatan, Mexico

John Downer / Sacred Cenote (limestone sinkhole) used by Mayans for human sacrifice, Chichen Itza, Yucatan, Mexico

Gavin Hellier / El Castilo pyramid Mayan Ruins at Chichen Itza, Yucatan, Mexico, Central America. Maya Civilization 500 - 900 AD

Shane P. White / Temple of Kukulcan (El Castillo) and aloe, Mayan ruins, Chichen Itza, Yucatan, Mexico, UNESCO World Heritage Site