長城, known as the Great Wall of China, is a series of fortifications built to protect Chinese states from invasions. Stretching over 13,000 miles, it was constructed over several dynasties, with the most famous sections built during the 明朝 (Ming Dynasty). The wall features walls, trenches, and natural barriers, showcasing ancient engineering skills. Today, the Great Wall is a UNESCO World Heritage Site and a popular tourist destination. Visitors can explore various sections, such as 八达岭 and 慕田峪, which offer stunning views and insights into China's history. The wall symbolizes the strength and perseverance of the Chinese people.