During the Ming Dynasty in China (1368–1644), the Great Wall of China was significantly rebuilt and expanded. This monumental structure was originally constructed centuries earlier but underwent extensive renovations and additions under the Ming emperors due to the need for protection against invasions from northern tribes, particularly the Mongols. The wall, featuring watchtowers and fortifications, symbolizes China's strength and resilience. It served not only as a military defense but also as a means of border control and trade regulation. The Great Wall remains a UNESCO World Heritage site today, highlighting its historical and cultural significance.