Exterior facade of the Citadel of Saladin (Qalat Salah El-Din) in the Al-Khalifa district of Cairo, captured from Salah Salem Street near Al-Qala'a Square. The medieval limestone fortification, built in the 12th century by Ayyubid Sultan Saladin, features massive circular towers and high stone walls lined with tall palm trees. The Ottoman-style minarets and large dome of the Mosque of Mohamed Ali (El-Alabaster Mosque) are prominently visible rising above the citadel walls in the background.