There is an enclosed walk way at the top of Tower Bridge that has now been turned into a museum. The price of admission also allows access to a museum containing the steam engines originally used to open and close the bascules.

I can’t say that the museum was worth the £5.50 entrance fee. There were a couple of videos on why and how the bridge was built. The view from the walkway wasn’t fantastic. You get a better view from the top of St Paul’s or the Eye. Personally I think you should save your money. The best view is of the bridge itself and you don’t have to pay to look at that!