The medieval structure often associated with knights is the castle. Castles were built primarily during the Middle Ages as fortified residences for nobility and functioned as a stronghold for defense against invaders. They were equipped with thick walls, towers, and various defensive structures such as moats and drawbridges. Castles also served as administrative centers for feudal lords, places for gatherings, and symbols of power and prestige. Interiors typically featured living quarters, banquet halls, and armories. Today, many castles are historical sites, attracting tourists interested in medieval history and architecture.