To the northwest and north of Beijing, a huge, serrated wall zigzags it's way to the east and west along the undulating mountains. This is the Great Wall, which is said to be visible from the moon.
Construction of the Great Wall started in the 7th century B.C. The vassal states under the Zhou Dynasty in the northern parts of the country each built their own walls for defence purposes. After the state of Qin unified China in 221 B.C., it joined the walls to hold off the invaders from the Xiongnu tribes in the north and extended them to more than 10,000 li or 5,000 kilometers. This is the origin of the name Of the "10,000-li Great Wall".
The Great Wall was renovated from time to time after the Qin Dynasty. A major renovation started with the founding of the Ming Dynasty in 1368, and took 200 years to complete. The wall we see today is almost exactly the result of this effort. With a total length of over 6,000 kilometers, it extends to the jiayu Pass in Gansu Province in the west and to the mouth of the Yalu River in Liaoning Province in the east. What lies north of Beijing is but a small section of it.
对西北地区和北京北部，一个巨大的，锯齿状壁曲折，它的方式向东、西沿起伏的山脉。这是长城，它是说是从月球上看到的。长城的建设开始于公元前第七世纪在周朝诸侯国在该国北部地区建立自己的墙壁，用于国防目的。秦国统一中国后，于公元前221年，它加入了墙壁，把侵略者从匈奴部落在北美和扩展到10000多个锂或5000公里。这是名称由来的“长城””。长城是装修后不时秦朝。一项重大革新始于明代开国1368，并花了200年时间完成。今天我们看到的长城几乎是这一努力的结果。与总长度超过6000公里，它延伸到嘉鱼在甘肃省西部和鸭绿江的辽宁省的东。什么是北北京不过是它的一小部分。