长城是中国具有代表性的古代建筑之一，也是世界文化遗产之一。长城的建造始于春秋战国时期，历经秦、汉、唐、明等朝代的修建和扩展，至今已有两千多年的历史。长城是中国古代军事防御工程的杰出代表，其主要建筑材料为石块、夯土和砖石。长城全长超过20000公里，横跨中国北方的山脉、草原、沙漠和平原，是中国的标志性建筑之一，也是世界上最长的城墙。

英语版：

The Great Wall is one of the most representative ancient architectures in China and also a world cultural heritage. The construction of the Great Wall began in the Spring and Autumn Period and lasted for more than 2,000 years, through the Qin, Han, Tang, and Ming dynasties. The Great Wall is an outstanding representative of ancient Chinese military defense engineering, and its main building materials are rocks, rammed earth, and bricks. The Great Wall spans over 20,000 kilometers, crossing the mountains, grasslands, deserts, and plains of northern China. It is a symbol of China's architecture and the longest wall in the world.