In the tropical forests of Guatemala and Mexico stand some of the most captivating sacred sites of ancient Mayan civilization. Scientists long believed these magnificent temples and pyramids were built to watch the sky, but new discoveries in the last decade reveal sacred caves and tunnels hidden beneath the pyramids. Using cutting-edge science, archaeologists identify the location the Maya revered as the most sacred temple of all – the mystical center of the world. With this discovery, this episode may unlock an incredible secret in the Mayan city of Chichen Itza.