European castles are fortified structures built primarily during the Middle Ages. They served as residences for nobility and were designed for defense against invasions. Many castles feature thick stone walls, towers, and moats, reflecting the architectural styles of their time, such as Romanesque and Gothic. Today, these castles are popular tourist attractions, showcasing rich histories and stunning architecture. Notable examples include Neuschwanstein Castle in Germany and Edinburgh Castle in Scotland. Many castles also host events, reenactments, and festivals, allowing visitors to experience the medieval lifestyle and culture.