Finnish castles are historical structures that reflect the country's rich heritage and architectural styles. Many of these castles, such as Turku Castle and Olavinlinna, were built during the Middle Ages and served as fortifications against invasions. They often feature thick stone walls, towers, and moats, showcasing the military architecture of their time. Today, many Finnish castles are popular tourist attractions, offering insights into Finland's history and culture. Visitors can explore their museums, attend events, and enjoy guided tours that highlight the castles' significance in Finnish history and their roles in various historical conflicts.