This was the only place that required covered arms and legs (but they provided cover-ups if you were too exposed). The Citadel has a long history. Check out the Wikipedia page for more info.
http://en.wikipedia.org/wiki/Cairo_Citadel
Inside the interesting lit mosque, our guide Aladdin gave a great lecture on religions in Egypt. (And he has a very informative web page that shows you how cute he is and if you ever want to travel to Egypt make sure you read his travel tips.)
http://www.ask-aladdin.com/aladdin_khalifa.htm
