In 1967, young people from across the United States came to San Francisco to take part in what came to be known as the Summer of Love. Watch the first chapter of “Summer of Love” before it airs next Tuesday, June 12 at 9/8c on PBS. | American Experience | PBS

#ThrowbackThursday to these Hippies in Haight-Ashbury dancing and listening to the Grateful Dead as they play on a temporary outdoor stage in Panhandle Park on April 20, 1967. (Footage by Getty Images) | SFGATE