长城,又称万里长城,是中国古代军事防御工程。长城修筑的历史可上溯到西周时期,著名的典故“烽火戏诸侯”就源于此。春秋战国时期列国争霸,互相防守,长城修筑进入第一个高潮,但此时修筑的长度都比较短。秦灭六国统一天下后,秦始皇连接和修缮战国长城,始有万里长城之称。明朝是最后一 The Great Wall, also known as the Great Wall, is an ancient Chinese military defense project. The history of the Great Wall can be traced back to the Western Zhou Dynasty, the famous story “flames opera princes” comes from this. During the Spring-Autumn and Warring States Period, the nations of the world hegemony and defense of each other, the Great Wall into the first climax, but at this time the length of the construction is relatively short. After the Qin Dynasty destroyed the reunification of the six nations, the Qin Shi Huang connected and repaired the Great Wall of the Warring States and began to call the Great Wall. The Ming Dynasty is the last one