Alcatraz is one of the most notorious federal penitentiaries in American history. Only the most violent and difficult prisoners in the U.S. were sent there. The conditions were so harsh that murder, insanity, and escape attempts were frequent. Alcatraz was reputed to be escape proof; yet in 1962 three men managed to do the impossible and to this day, they have never been found. This mystery has plagued "the Rock" for decades. MysteryQuest investigates the famous case to determine whether they could have survived the icy waters of San Francisco Bay. New evidence and witness testimony may finally reveal the true story behind the decades-old mystery that has captured the world's imagination.

To this day no one knows the true purpose of Stonehenge, the ancient monument in the British countryside. There are many theories: a shrine celebrating a god; an ancient solar calendar; or maybe a sacrificial altar for an unknown pagan religion. MysteryQuest travels to the ancient ruin with a new theory–that ancient people may have used the sound reverberations inside this circle to induce a trance-like state among participants in ancient rituals. Were there bizarre rituals, even sacrifices, to some long-forgotten god? The team will attempt to find evidence that could crack open this persistent mystery.