It's certainly true that the entrance fee for the Tower is out of this planet (same for other London attractions like Buckingham Palace) and the lines are about a kilometer long, but this is worth it. The Tower of London is one of Britain's most interesting attractions, not the least because of its traditions - the ravens, the beefeaters, the stories about the executions. And then of course its highlight - the crown jewels. High security, and you wouldn't want to get caught taking a picture - they will rip the film out of your camera. But still a very exciting visit, also in terms of historical aspects (William the Conqueror, the Normans) and architecture (the White Tower, also the nearby Tower Bridge).