The Cairo Citadel is a medieval Islamic fortification that offers panoramic views of the city. It was built by Salah ad-Din in the 12th century and served as the seat of government for many centuries. Within the citadel, visitors can explore the impressive Mosque of Muhammad Ali, also known as the Alabaster Mosque, which is one of Cairo's most famous landmarks. The citadel is a great place to learn about the city's history and enjoy breathtaking views of Cairo.