Westminster Abbey or The Dakota?

I'd probably go with Westminster Abbey. Although the Dakota dates to the 1880s, it's really it's association with John Lennon that makes it famous today. The gothic churches of Europe tend to be well renowned for their appearances. There's quite a bit to the architecture of the churches that make them alike, but also quite a bit that make them different from each other. Add to that the fact that Westminster Abbey is also the final resting place for Percy Shelly, the Bronte sisters, Charles Dickens, Jane Austen, Laurence Olivier, Lord Byron, Robert Burns, Alferd Lord Tennyson, Issac Newton, Charles Darwin, Elizabeth I, William Shakespear, Henry V, among many other noteables and also containsthe tomb of The Unknown Warrior for a British WWI soldier and the interest actually rises. Their buried inside the portions of the Abbey and it's considered a great honor to be laid to rest there. That actually increases interest in it as folks like to visit the final resting place of famous individuals.