Estonian castles are historical structures that reflect the country's rich heritage and architectural diversity. Many of these castles were built during the Middle Ages by various rulers, including the Teutonic Knights and local nobility. Notable examples include Toompea Castle in Tallinn and Kuressaare Castle on Saaremaa Island, showcasing different styles and purposes. These castles served various functions, from military fortifications to noble residences. Today, many have been restored and are open to the public, offering insights into Estonia's history and culture. They often host museums, exhibitions, and events, making them popular tourist attractions.