Site: Last Beatles' concert (1 memorial)
W1, Savile Row, 3
From MentalFloss: "On January 30, 1969, at lunch time, The Beatles appeared on the rooftop of their record label’s headquarters, unannounced, and started performing. Londoners looked on with excitement and bafflement as the world’s biggest band, which hadn’t played live in two and a half years, tried out new material for 42 minutes. It would end up being their final live show." That site has a 3 minute video of the event.