"The city of San Francisco has been warned of a hippie invasion come summer in numbers almost too staggering to comprehend," declared one TV news reporter.

Although San Francisco's 1960s counterculture fizzled out, its spirit is alive and well at the Hippie Hill drum circle.

1967 was a landmark year bridging early ’60s pop sensibility with an emerging hippie culture. The "Summer of Love" brought young people and wannabes to San Francisco with their shared interest in ...

The untold story of how a German cult, pioneering psychologists and secret LSD experiments sparked a gathering of hippie tribes in 1967 San Francisco that would change the world.