Between 250 and 900 CE the Maya civilization built some of the most spectacular cities in history. They perfected mathematics, astronomy, architecture and the calendar. However, there was also a dark side — evidence of human sacrifices and war. But from around 900 CE the Maya’s luck ran out and their great cities were largely abandoned. Were their gods displeased? Archaeologists scour the jungles of Central America looking for clues to help explain the spectacular collapse of the Maya Civilization.