Tourist attractions in Ceuta

I was looking up a cruise for someone the other when I noticed a city on the itinerary that I'd never seen before. As it was a fairly standard cruise to the Canaries you can imagine this surprised me., I thought I knew all the ports of call in that area.
The more I read about it though, the more interesting it sounded so I decided to put together a little guide for you of "what is there to do in Ceuta" if you ever find yourself there.