A living piece of history that still has active us...

A living piece of history that still has active use, including the display of the Crown Jewels. Definitely take the Yeoman Warden guided tour that is included with the admission price. They are very knowledgeable and undergo a rigorous selection process to perform the duties of their role of the Queen's Guard.
The Tower Ravens are famous, quite large, and seem to enjoy intimdation of small children; they're quite a sight as well.