The castle is a large fortified building, often built in the medieval period, designed for defense and residence. Castles typically feature thick stone walls, towers, and a moat, providing protection against invaders. They served as homes for nobility and were centers of administration and military power. Inside, castles often included living quarters, a great hall, and storage areas. Many castles, such as Neuschwanstein Castle in Germany or Edinburgh Castle in Scotland, are now popular tourist attractions, showcasing historical architecture and offering insights into the lives of those who lived there during the Middle Ages.