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The Mosque-Madrassa of Sultan Hassan is a massive mosque and madrassa located in the Old city of Cairo, it was built during the Mamluk Islamic era in Egypt.
circa 1356 CE
Mosque-Madrassa of Sultan Hassan as seen from Cairo Citadel. Its construction began 1356 CE (757 Hj.) with work ending three years later "without even a single day of idleness". The mosque was, for example, designed to include schools for all four of the Sunni schools of thought: Shafi'i, Maliki, Hanafi and Hanbali. The Mosque of Sultan Hasan is one of the largest mosques in the world, measuring 150m in length and covering an area of 7,906 sq m.