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

San Francisco is a 1936 musical-drama disaster film directed by W. S. Van Dyke, based on the April 18, 1906 San Francisco earthquake. The film stars Clark Gable, Jeanette MacDonald and Spencer Tracy. MacDonald's singing helped make this film a major hit, coming on the heels of her other 1936 blockbuster, Rose Marie. On New Year's Eve, 1905, saloon keeper "Blackie" Norton hires Mary Blake to sing in his bar, the Paradise Club on Pacific Street in the notorious Barbary Coast of San Francisco. Mary

#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