The Citadel of Cairo or Citadel of Saladin is a medieval Islamic-era fortification in Cairo, Egypt, built by Salah ad-Din (Saladin) and further developed by subsequent Egyptian rulers. It was the seat of government in Egypt and the residence of its rulers for nearly 700 years from the 13th to the 19th centuries. Its location on a promontory of the Mokattam hills near the center of Cairo commands a strategic position overlooking the city and dominating its skyline. At the time of its construction, it was among the most impressive and ambitious military fortification projects of its time. It is now a preserved historic site, including mosques and museums.

Mohamed Ali pasha mosque at citadel of Saladin,Cairo,Egypt. Also known as Alabaster mosque, because of the outer casing of the walls up to 13 meters high. this mosque has been built by Mohamed Ali pasha the Turkish ruler in Egypt ( 1805- 1848 ). he built this mosque on honor of his son Tusson pasha, who died in early age. he start building the mosque 1825 and finish 1848. The designer was Turkish architect Yousf Bushnaq, who designed the mosque in the same shape of the blue mosque in Istanbul Turkey. The mosque divided for 2 parts, The atrium & the mosque. with its great dome ( 52 m. high ) and two great minarets ( 84 m. high ).