Historical walls are structures built in various cultures to serve as fortifications, boundaries, or symbols of power. They often reflect the architectural styles and materials available at the time of their construction. Famous examples include the Great Wall of China, which was built to protect against invasions, and the Berlin Wall, which symbolized the division of East and West Germany during the Cold War. These walls can also represent significant historical events and societal changes. For instance, the City Walls of Dubrovnik in Croatia showcase medieval engineering and the importance of trade and defense. Many historical walls are now preserved as cultural heritage sites, attracting tourists and scholars alike.