The document summarizes key parts and landmarks of London: London is divided into 4 parts - The City, Westminster, The West End, and The East End. The City is the oldest and financial district, Westminster is the official district, the West End is richest, and the East End is industrial. Key landmarks include Big Ben and the Houses of Parliament in Westminster, St. Paul's Cathedral built after the Great Fire, Piccadilly Circus square known for shops and food, and Westminster Abbey where coronations occurred.