Castles are large fortified structures built during the Middle Ages, primarily in Europe. They served as residences for nobility and were designed for defense against attacks. Castles often featured thick stone walls, towers, and moats, which helped protect the inhabitants from invaders. Many castles also included living quarters, storage areas, and places for entertainment. Over time, castles evolved in design and purpose. While some were built for military defense, others became symbols of power and wealth. Today, many castles, such as Neuschwanstein Castle in Germany and Edinburgh Castle in Scotland, are popular tourist attractions, showcasing historical architecture and offering insights into medieval life.