One of Cairo's most popular tourist attractions is the Citadel, located on a spur of limestone that had been detached from its parent Moqattam Hills by quarrying. The Citadel is one of the world's greatest monuments to medieval warfare, as well as a highly visible landmark on Cairo's eastern skyline. Between 1176 and 1183, Salah ad-Din (Saladin to Westerners 1171-1193 AD), an Abbasid Ruler, fortified the area to protect it against attacks by the Crusaders, and since then, it has never been without a military garrison. Originally it served as both a fortress and a royal city.
Salah ad-Din used the most modern fortress building techniques of that time to construct the original Citadel. Great, round towers were build protruding from the walls so that defenders could direct flanking fire on those who might scale the walls. The walls themselves were ten meters (30 ft) high and three meters (10 ft) thick.
IWNTA - SIGHTSEEING - Cairo - The Citadel