The virtually endless cave system beneath the jungles of Guatemala is one of the last truly unexplored places on Earth. In this fascinating program, an elite team of professional cavers and scientists penetrates one of the deepest, most mysterious caves in the world - the Naj Tunich. Guided by experts Paul Burger, Hazel Barton, and John Climaco, explore the ancient secrets of this sacred Mayan site. Gripping camerawork not only illuminates the surprising discoveries made in Naj Tunich, but also captures the technical challenges and dangers of this bold and breathtaking exploration. Watch as the team uncovers evidence of a darker side to Mayan culture, including human skeletons, razor-sharp obsidian needles, and ritualistic and sexual paintings. What do these findings mean, and what were the Ancient Mayans doing so deep within the bowels of the earth? Investigate the answers to these, and many other questions on this magnificent Journey to the Center of the World.