Unsolved History: Salem Witch Trials en streaming. Scores of people were imprisoned and executed during the infamous Salem witch trials of the 1600s. Investigators examine the era's rampant anti-witch sentiment from a scientific viewpoint, testing some of the theories that have been proposed over the years. The documentary is part of Discovery Channel's "Unsolved History" series, which takes a detailed forensic approach to some of history's most vexing mysteries.