Bent entrances are typical of Arab fortifications and crusader castles. The Citadel of Aleppo is a good example of the former, with a massive gate tower enclosing a complicated passage. The most elaborate bent entrance among crusader castles is the turning entrance ramp at Crac des Chevaliers, which is defensible from several towers and via machicolations. In addition to the main gate, postern gates could also feature a bent entrance, usually on a smaller scale. For instance, in the ruined crusader castle at Belvoir, posterns open into the moat at the angle between the outer wall and the corner towers.