The famous wall built in China to protect against invasions from the north is the Great Wall of China. Construction of various sections began as early as the 7th century BCE and continued through successive dynasties, particularly the Ming Dynasty (1368–1644). The Great Wall served as a defense mechanism against nomadic invasions, securing trade routes and facilitating territorial control. Beyond its military purpose, it symbolizes Chinese strength, unity, and resilience. Today, the Great Wall is a UNESCO World Heritage site and stands as an iconic landmark, reflecting China's historical struggles and achievements in fortification and national identity.