Historical castles are large fortified structures built primarily during the Middle Ages. They served as residences for nobility and as military strongholds. Castles often featured thick stone walls, towers, and moats for protection against invaders. Many castles, such as Neuschwanstein Castle in Germany and Edinburgh Castle in Scotland, are now popular tourist attractions. These castles reflect the architectural styles and social hierarchies of their time. They were often strategically located on hills or near important trade routes. Today, they provide insight into the history of feudalism and the lives of medieval lords and ladies.