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长城是中国也是世界上修建时间最长、工程量最大的一项古代防御工程。它始建于7～4世纪的春秋战国时期,后经秦、汉、晋、北魏、东魏、北齐、西魏、北周、隋、宋、辽、金、明、清等朝代的不断修建,历经2500余年。它东、西、南、北纵横交错绵延起伏于中国辽阔的土地上。东起河北
The Great Wall is an ancient defense project with the longest construction volume and the largest construction volume in China and in the world. It was built in the Spring and Autumn Period and the Warring States Period from the 7th to the 4th centuries and has been continuously constructed by the dynasties of Qin, Han, Jin, Northern Wei, Eastern Wei, Northern Qi, Western Wei, Northern Zhou, Sui, Song, Liao, Jin, Ming and Qing dynasties I year. It east, west, south and north criss-cross in the vast land of China. East from Hebei