我国古代伟大的工程之一.始建于春秋战国(公元前770～476),今存者为明代所修建.西起甘肃嘉峪关,东到辽宁丹东 鸭绿江畔的虎山口,横亘甘肃,宁夏,陕西,山西,蒙古,河北,辽宁等地.沿线险要或交通要冲都设有关口,如山海关,居庸关,娘子关等.简称为长城.最初修筑长城的是战国时代的燕,赵等国,目的是为了防御北方异族的侵袭.

秦始皇后来将这些断断续续的长城连接起来.据说当时动用了三十万的兵士和数百万的人民与奴隶.不过,长城并不能达到完全防止异族入侵的效果.因为长城完成之后,北方异族依然常跨越长城,偷袭中国边境的村落,抢夺农作物或家畜.

长城是有史以来唯一在太空中可见到的三度空间建筑物.以现代科技来修筑都不容易,而我国竟能建筑于两千多年前的春秋战国时代,实在难得.长城的建材系就地取材,各地颇不相同.汉代以泥和芦苇修筑长城.长城体积也各不相同,以居庸关一带来说,高约8.5公尺,下部宽8.5公尺,上部宽约5公尺.每隔70～100公尺有一堡寨(相当于城楼),高约12.3公尺,多数堡寨是一重的,要害之地则置两,三重.

长城东段经过山地或丘陵地,古称「堑山堙古」,「用险制塞」,起伏蜿蜒,形式雄伟;中段,西段都在干燥区域,人烟稀少,仅色荒凉.如果登临其间的雁门关,居庸关,古北口或山海关,遥望我国山川的伟大形势,将令人叹服先民开疆拓土的艰难,而激起无限的壮志雄心.

Our project is one of the great ancient. Was built in Spring and Autumn (BC 770 ~ 476), for this deposit are built by the Ming Dynasty. Jiayuguan in Gansu from the West, east to the banks of the Yalu River in Liaoning Dandong Tiger Pass, exists Gansu, Ningxia, Shaanxi , Shanxi, Mongolia, Hebei, Liaoning, and other places. position in traffic along the strategically located and difficult of access or gateway are provided, such as Shanhaiguan, Juyongguan, Niangziguan, etc.. referred to as the Great Wall. initial construction of the Great Wall is the Warring States era Yan, Zhao, and other countries, is designed to defense north alien invasion.

Qin Shihuang was the Great Wall of these intermittent link to the then reportedly spent 300,000 soldiers and millions of people and the slaves, but the Great Wall can not be completely prevent alien invasion results. Since after the completion of the Great Wall, still often mixed across the North Great Wall, the attack on the Chinese border villages, grabbed the crops or livestock.

The Great Wall is the only history can be seen in the space of three buildings. Modern technology to build not easy, and the construction of China's unexpectedly more than 2,000 years ago in the Spring and Autumn era, it is rare. Department of the material on the Great Wall and based, quite different around. mud and reed to the Han Dynasty built the Great Wall. size of the Great Wall have different to Juyongguan area, about 8.5 meters high, the bottom width 8.5 meters and a width of 5 meters upper. each at 70 ~ 100 meters a堡寨(equivalent城楼), about 12.3 meters high, the majority of堡寨is a heavier, the crucial point is the home to two or three.

The eastern section of the Great Wall after mountain or hilly,古称"Cutting-hwa ancient" and "used risk-Cypriot" ups and downs winding, majestic form; middle and western regions are in dry, sparsely populated, the only color desolate. Board, which if the Yanmenguan, Juyongguan, Gubeikou or Shanhaiguan, the great mountains and rivers Looking to the situation in China, is Newly inhabitants开疆拓土difficult, and aroused the aspiration of unlimited ambition.