The Tower Bridge is a fascinating structure. Only 125 years old, it looks much older (designed on purpose to match the gothic look of the nearby Tower of London) even though it is impeccably maintained. We were specially fascinated by the pump room downstairs. The photos of great bridges around the World in th exhibition on the top are also a lot of fun. We went in the middle of the day so it wasn't crowded and we were able to enjoy the great Thames views from the top on our own time. 

The view of the bridge below is from inside the Tower of London and one of the best I found. 

(-Week #197/300)