A London Bridge

        For some reason folks think this is the London Bridge. I suspect that is because it is much more interesting than the real London Bridge (the original is in Arizona brought over piece by piece). 

        This is the Tower Bridge, not because it has two towers but because it is at the Tower of London. In fact, I took this photo from the rampart of the Tower of London which runs along the Thames.

        The Tower Bridge opens for ships to pass. The walkway is at the top, it is the lower roadbed that raises and lowers.