If you thought the drug culture peaked in the 1960s, you're only off by a few millennia. In fact, since the beginning of civilization, humans have explored means of altering their consciousness in search of something "greater" than everyday reality. ANCIENT MYSTERIES takes an in-depth look at our pervasive drive to experience something "beyond," and reveals the means by which our ancestors explored their inner world. From experiments with substances at the edge of lethality to mysterious rituals meant to help worshipers leave their bodies behind, ANCIENT ALTERED STATES explores the farthest reaches of this primitive and universal desire. Psychologists and physicians, including Dr. Andrew Weil, offer insight into the physical and mental mechanisms and motivations behind this quest. Historians and spiritualists explore the ancient rituals of cultures worldwide that have sought visions and truth through altered consciousness. And riveting footage illuminates the terrifying, exquisite visions revealed to those who journey beyond the constraints of the conscious mind.

• Leonard Nimoy