Tourists usually think this is the "London Bridge" from the children's song, but it isn't That is further upriver, and a lot less interesting looking. This is the Tower Bridge, so called because it is adjacent to the Tower of London. It is actually a drawbridge, but the decks are rarely raised these days, as most heavy shipping happens downstream. It is interesting to keep an eye on the river when you visit. The Thames is given to wild swings in tide. Dinghies that are tied to buoys and floating 20 feet from shore may be resting on the muddy bottom of the river by the time you're done with the tour.