Medieval castles were fortified structures built during the Middle Ages, primarily to serve as residences for nobility and as defensive strongholds. They were often strategically located on hills or near rivers to enhance their defensive capabilities. Castles featured thick stone walls, towers, and moats, which provided protection against invaders and served as a symbol of power and prestige for their owners. The design and function of castles evolved over time, reflecting changes in military technology and social structure. Notable examples include Windsor Castle in England and Neuschwanstein Castle in Germany, which showcase the grandeur and complexity of medieval architecture. These castles not only served military purposes but also became centers of administration and culture in their regions.