Crusader Castles were fortifications built during the Crusades, a series of religious wars in the medieval period aimed at reclaiming the Holy Land. These castles served as military strongholds for the Knights Templar and other Christian forces, providing protection and a base for operations against Muslim territories. They often featured thick stone walls, towers, and moats to defend against attacks. Many of these castles were strategically located on hills or near important trade routes, allowing for better surveillance and control of the surrounding area. Notable examples include Kerak in Jordan and Acre in Israel, which showcase the architectural styles and military innovations of the time.