Castles are large fortified structures built during the Middle Ages, primarily in Europe. They served as residences for nobility and as military strongholds. Characterized by thick walls, towers, and moats, castles were designed to protect inhabitants from invasions and attacks. Famous examples include Neuschwanstein Castle in Germany and Edinburgh Castle in Scotland. Over time, castles evolved in design and purpose, reflecting the changing needs of society. They became symbols of power and prestige, often featuring elaborate decorations and expansive grounds. Today, many castles are preserved as historical sites, attracting tourists eager to explore their rich history and architecture.