The Tower of London is very old, isn't it? What is it famous for?

The Tower of London is really very old. As for the words of Duke of Edinburgh, it was a castle, a palace, a prison, a zoo, etc. Now it's a museum, which attracts a lot of tourists every year. The Tower of London is famous not only for its history, but for wonderful legend. There are ravens which guard the Tower. The legend says that without them it can fall. So there is also the master who gives the ravens food. The Tower is wonderful by its building, great walls and outlook. I think every material and stone of this great building keep something ancient and amazing in the Tower. It's worth seeing, I'm sure.