Last but not least: above is a photo of the infamous Bloody Tower, where -- it's believed-- in 1483 the Duke of Gloucester imprisoned his two young nephews, the princes who were the rightful heirs to the crown. They disappeared; he became King Richard the Third.
For lots more history, see the Tower of London Virtual Tour site, which also has a special tour for kids.
All in all, the Tower of London is a must-see attraction, and the more you know about its history, the more fascinating it becomes.
It would be interesting, too, to see the "Ceremony of the Keys": the traditional lock-up of the Tower of London at night. Every night -- at seven minutes to 10 pm-- the Chief Warder emerges from the Byward Tower in colorful dress, carrying a lantern and the Queen's Keys, for a brief ceremony that's been much the same for 700 years.
