The rooftop where the band played its final show will be the seven-story archive’s summit Getty Images The London townhouse where the Beatles recorded Let It Be , and, on the rooftop, performed their last concert, will open to the public next year as a museum. Among the promised attractions are a recreation of the Let It Be studio, rotating exhibitions, and a bevy of archival material spread across seven stories. Paul McCartney , who is preparing to release his album The Boys of Dungeon Lane this month, recently returned to the venue. “It was such a trip,” he said in a press release. “There are so many special memories within the walls, not to mention the rooftop.…