Great Wall
Great Wall, is the ancient China to resist the different periods of Saibei nomadic tribal alliance of the invasion, the construction of large-scale military engineering collectively. Great Wall things stretches on thousands of miles, it is also known as the Great Wall. The existing Great Wall remains mainly built in the 14th century Ming Great Wall, west of Jiayuguan, east of the Great Wall, the Great Wall site across Beijing, Tianjin, Qinghai, Shanxi, Inner Mongolia and other 15 provinces and autonomous regions, a total of 43,721 Great Wall heritage. The Great Wall is also the largest single building since human civilization, as well as the oldest building with the longest repair time. In April 2009, the National Bureau of Surveying and Mapping and the State Administration of Cultural Heritage reported that the latest full archaeological research shows that the Great Wall is 8851.8 kilometers in length, of which the length of the artificial wall is 6259.6 kilometers, the length of the trench is 359.7 kilometers, the length of the natural insurance is 2232.5 Km, the average wall height of 6 to 7 meters, 4 to 5 meters wide. June 5, 2012, the State Administration of Cultural Heritage announced that after nearly five years of investigation and identification, the total length of the ancient Chinese history of 24496.18 km. This is China's first scientific, systematic measurement of the total length of the ancient Great Wall. The length is about 108 times longer than the second place in the Iranian Golgong Great Wall (195 km). ...