Princess Margaret, the late sister of Queen Elizabeth II, took San Francisco by storm in 1965.
The princess and her husband arrived in San Francisco with an entourage of 16 and were greeted by then Mayor John Shelley and his family.
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Hundreds of fans gathered at San Francisco International Airport and along San Francisco streets to greet the princess. Among the celebrities to meet the princess were San Francisco native Carol Channing, in town for a production of "Hello Dolly."
The princess stopped by the San Francisco Press Club to receive an award and give an unheard of Royal press conference.
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"I've longed to come to this country for ages," the princess said, "and I am thrilled that it has become a reality."
"We are delighted that our visit should start here in your beautiful city of San Francisco," she added.
The visit included a trip to Monterey and UC Berkeley, catching a ride on a cable car, taking in a visit to Coit Tower, and a Mass at Grace Cathedral before heading to Los Angeles.