Crusader Castle refers to a series of fortifications built during the Crusades, a series of religious wars in the medieval period. These castles were constructed by European Christians to protect their territories in the Holy Land and to serve as military strongholds. Notable examples include Krak des Chevaliers in Syria and Montfort Castle in Israel, showcasing advanced military architecture of the time. These castles often featured thick stone walls, towers, and moats, designed to withstand sieges and attacks. They served not only as military bases but also as administrative centers for the Crusader states. Today, many of these castles are historical sites, attracting tourists and historians alike.