Plants of the Gods: S2E4. Magic Mushrooms and the Roots (actually, the Mycelia) of the Psychedelic Renaissance
The much-heralded Psychedelic Renaissance began in 1938 when Harvard graduate student Richard Schultes traveled to southern Mexico to investigate reports that the Mazatec peoples were ingesting mind-altering mushrooms for healing and divinatory purposes. His findings led to further research in both the field and the lab by folks like Gordon Wasson and Albert Hofmann, and this in turn eventually brought the healing potential of these and other mind-altering natural substances to the outside world.