Tower Bridge was opened in 1894 and has become one of the most iconic symbols of London. It's just a short walk from the Tower of London.
If you have the time, I'd recommend the self guided tour. It will take you through the history and inner-workings of the bridge. It's a fun tour for families and it includes a fun photo opportunity as your cross over a glass floor between the two towers of the bridge. At the end of the tour, you can go inside the base of the bridge and see how they raise and lower the draw bridge for tall ships to pass through the River Thames. Starting today, you can add Tower Bridge to your Duckwyn Passport book.