The document provides information about several famous landmarks and attractions in the United Kingdom, specifically in London. It discusses the Tower of London, a 900-year-old historic castle and former royal residence that now operates as a museum. It also mentions Big Ben, the iconic clock tower on the Houses of Parliament; Trafalgar Square, a popular tourist site in the center of London; and Tower Bridge, the iconic drawbridge over the River Thames. It provides details about the Sherlock Holmes Museum, dedicated to the famous literary detective, as well as Legoland, a theme park featuring attractions made of Lego bricks.