.The Great Wall
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The Great Wall, a remarkable military defensive structure in ancient China, stretches over 21,000 kilometers from east to west across northern China. Construction began during the Zhou Dynasty and was expanded by various dynasties, especially the Qin and Ming dynasties. It's not just a wall but a complex defensive system including forts, watchtowers, and barriers. The Great Wall symbolizes Chinese wisdom, courage, and perseverance, and has been designated a World Heritage Site by UNESCO.