The construction of the Great Wall of China began in 7th century BC during the Warring States period. However, the most famous sections of the wall we know today were built during the Ming Dynasty, which lasted from 1368 to 1644. The wall was originally constructed for defense against invasions and raids from nomadic tribes. Over centuries, various dynasties contributed to its expansion and fortification, resulting in a network of walls stretching over 13,000 miles. The Great Wall is not only an architectural marvel but also a symbol of China's historical strength and perseverance against external threats.