There is no doubt that the Tower is worthy to be on the WH list because of its historical significance. However, every time when I visited London, I've viewed the Tower from the outside only. The high entrance fee and the queues at the ticket office have deterred me. Moreover, I'm not very interested in the crown jewels and the collection of arms and armour. Anyway, in 2006 I visited the interior, simply because I thought that otherwise I could not tick off this WHS. It was very busy and the Beefeater tours were too crowded to really enjoy them. I visited the White Tower and had a nice walk around the walls, but I spent not too much time there. I would not say that I was disappointed because I did not expect too much.
But during my last visit in London in summer 2010, I've partially changed my opinion. I attended the Ceremony of the Keys, a ceremonial that takes place each night since the 14th Century. It begins exactly at 9:53 pm. The main gates of the Tower are locked up following a centuries-old ceremony. The Chief Warder and the guards speak always the same words. During the ceremony, it is not allowed to walk around, to talk, and to take pictures. Visitors can attend for free, but a ticket is required. This ticket must be ordered by regular mail several weeks before the requested date (Information on the website of the Tower). The ceremony is one of these typical English traditions and it is much more worthwhile as for example the Changing of the Guard at the Buckingham Palace.