Ibn Tulun Mosque, Cairo

The minaret of the Mosque of Ibn Tulun in Cairo
http://en.wikipedia.org/wiki/Mosque_of_Ibn_Tulun

The Ibn Tulun Mosque - ArchNet

http://archnet.org/library/sites/one-site.jsp?site_id=2070 

 PLAN of the Ibn Tulun Mosque, 876-9
( from Henri Stierlin, Architecture de l'Islam, 1979) 

http://www.ne.jp/asahi/arc/ind/2_meisaku/18_ibntulun/ibn_eng.htm