Did you take a picture with the guards and try to get them to move (you'd get arrested). I've been all over Europe, and when I was in England Cambridge was a very pleasant place to reside in. Yes, both the palace and the tower of london weren't that great, but think how old they are I also went when I was thirteen, and guessing from what you have said so far, you're about 16 or 17. That's my prediction!