International vision: The Wall of Maqra al-Ayoun, one of the oldest historical landmarks in Cairo, was built to extend the Citadel of Salah al-Din with water by raising the Nile waters with streams to the course of the wall, for the water to flow up to the castle, where the castle was the seat of government in Egypt since the Ayyubid era, and the headquarters moved after that to Abdeen Palace .
