باب زويلة
In order to build the mosque, a portion of the Fatimid wall which used to surround Cairo had to be demolished; however, an old section of the wall was recently discovered within the mosque's structure and can be seen today by visitors. The two towers of the nearby gate of Bab Zuweila, set in the original wall, were saved from demolition and serve as the base of the mosque's two remaining minarets; an unusual and unique feature of this mosque complex.