Nero Wolfe story And Be a Villain by Rex Stout, wherein Nero Wolfe discusses the pointed arches with a guest. See also Lists of mosques List of mosques in Africa List of mosques in Egypt History of medieval Arabic and Western European domes References Works cited External links Ibn Tulun Mosque - entry on Archnet, with full bibliography 9th-century mosques Ibn Tulun Architecture in Egypt Ibn Tulun Old Cairo Tulunid dynasty Tulunid architecture in Cairo 9th-century establishments in Egypt 9th-century establishments in Africa Religious buildings and structures completed in 884