The Beijing City Wall was originally built during the Ming Dynasty in the 15th century to protect the city from invasions. Stretching approximately 42 kilometers, it featured watchtowers and gates, serving as a defensive structure and a symbol of the city's power. Over time, much of the wall has been dismantled, but some sections remain preserved for visitors. Today, the remaining parts of the wall can be explored, offering a glimpse into Beijing's historical significance. The wall's remnants are popular tourist attractions, allowing people to appreciate the architectural ingenuity and the rich history of China's capital city.