Deep within the jungles of Mexico and Guatemala and extending into the limestone shelf of the Yucatan peninsula lie mysterious temples and pyramids. Despite the towering reputation of Egypt’s Great Pyramids at Giza, the documentary shows the Americas actually contain more pyramid structures than the rest of the planet combined. Civilizations like the Olmec, Maya, Aztec and Inca all built pyramids. These were usually step pyramids, with temples on top more akin to the ziggurats of Mesopotamia than the Pyramids of Ancient Egypt. Mesoamerican Pyramids served many functions from – from astronomical observatories to places of ritual worship and sacrifice, and perhaps sometimes these are linked to extraterrestrials, but who really built these pyramids and why?