The Beatles played their last official concert on 29 August 1966, at Candlestick Park in San Francisco. Jim Marshall’s pictures capture the group at a pivotal moment, when they are already feeling nostalgia for what they are leaving behind. Two months earlier, the Beatles had finished precording Revolver, a glittering collection of pop gems. The next day they boarded a plane to begin a global tour during which they would play nothing from it.