Get there on a weekday before it opens to avoid long lines. Have a cup of coffee and enjoy the view of the Thames. Be sure to explore each tower, since the Tower of London is actually made up of several towers built over hundreds of years. There is a guided tour by a charming man in traditional garb, but only go if you are patient and don't have children. He talks a lot and thinks he's really funny. The audio tour is pretty good and lets you go at your own pace without a huge group following the same route. Be sure to see Sir Walter Raleigh's chambers too.

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