The summary describes a London tour that includes visiting Big Ben, the Houses of Parliament, Buckingham Palace where the Queen lives, Hyde Park, Piccadilly Circus, Covent Garden which was formerly a market but now has shops and theaters, Trafalgar Square, Camden Town, London Bridge, and St. Paul's Cathedral. The tour guide asks the children what they want to see first and explains that Big Ben is a big clock and was designed by an architect also named Ben.