Expect crowds-it very popular and rightly so. The unique architecture, historic value, and burial place honoring famous royals, scientists, writers, inventors, politicians, military and medical personage make Westminster Abby, a religious World Heritage Site, a sightseeing spot on most bucket lists. Take the time to stroll and examine the surroundings. Ignore the crowds and enjoy the experience. Highly recommend that you read/research the background of Westminster Abby so you know where to find what you want to see. It's huge!