The Great Wall of China is considered the largest ancient monument in the world. This immense structure, built to protect Chinese states from invasions, stretches over 13,000 miles across northern China. Construction of the wall began as early as the 7th century BC, with various dynasties contributing to its expansion and reinforcement, most notably the Ming Dynasty, which constructed the most recognizable sections we see today. The Great Wall not only served military purposes but also acted as a symbol of the enduring strength and ingenuity of Chinese civilization, becoming a UNESCO World Heritage site and a popular tourist attraction.