The Saladin Citadel of Cairo (Arabic: قلعة صلاح الدين‎ Qalaʿat Salāḥ ad-Dīn) is a fortification in Cairo, Egypt.

The location, part of the Muqattam hill near the center of Cairo, was once famous for its fresh breeze and grand views of the city, and was fortified by the Ayyubid ruler Salah al-Din (Saladin) between 1176 and 1183 AD, to protect it from the Crusaders[1].

Source. en.wikipedia.org/wiki/Cairo_Citadel

The Mosque of Muhammad Ali Pasha or Alabaster Mosque (Arabic: مسجد محمد علي, Turkish: Mehmet Ali Paşa Camii) is a mosque situated in the Citadel of Cairo in Egypt and commissioned by Muhammad Ali Pasha between 1830 and 1848.

Situated on the summit of the citadel, this Ottoman mosque, the largest to be built in the first half of the 19th century, is, with its animated silhouette and twin minarets, the most visible mosque in Cairo. The mosque was built in memory of Tusun Pasha, Muhammad Ali's oldest son, who died in 1816.

This mosque, along with the citadel, is one of the landmarks and tourist attractions of Cairo and is one of the first features to be seen when approaching the city from no matter which side.