Historic walls are structures built in various periods to serve as fortifications, boundaries, or symbols of power. They can be found in many parts of the world, often showcasing the architectural styles and materials of their time. Examples include the Great Wall of China, which was constructed to protect against invasions, and the Berlin Wall, which divided East and West Berlin during the Cold War. These walls often hold significant cultural and historical value, attracting tourists and researchers alike. They can represent the struggles and achievements of civilizations, as well as the evolution of military architecture. Preservation efforts are crucial to maintain these important landmarks for future generations.