Billed as "An Aquarian Exposition: 3 Days of Peace & Music," The Woodstock Music & Art Fair was held at a dairy farm in Bethel, New York from August 15 to August 18, 1969. With over 30 musical acts, the festival's planners (John Roberts, Joel Rosenman, Artie Kornfeld and Michael Lang) had anticipated a large crowd, but they didn't expect numbers to approach half a million people. 

Photographer Barry Z Levine captured this aerial image showing the sea of free spirits occupying a good chunk of Max Yasgur's 600-acre property.

Fun Fact: Although one person was born and three people died at Woodstock, there were no reported incidents of violence. Most of the 80 or so arrests at the festival were made on drug charges involving amphetamines, heroin and LSD. Go hallucinogens!