The Great Wall is a series of Chinese military fortifications built, destroyed and rebuilt several times and in several places between the third century BC. BC and the seventeenth century to mark and defend the northern border of China. This is the most important architectural structure ever built by man both in length, area and mass.
Popularly, it refers to as the "Great Wall" section built during the Ming dynasty from Shanhaiguan in the territory of the city of Qinhuangdao in Hebei Province in the east to get to Jiayuguan in Gansu province to West. Its length varies according to sources. According to a 1990 report, the total length of the walls would be 6 700 km. Because of its length, it is called in Chinese "The long wall of ten thousand li" (simplified Chinese: 万里长城, traditional Chinese: 萬里長城; pinyin: Wànlǐ Changcheng; Wade: Wan⁴li³ Ch'ang²ch'eng²), the li being a former unit of length, and ten thousand Chinese symbolizes infinity in Chinese. This nickname however can be taken in its literal sense by approximation, 6 700 km by 11,632 li in its generally considered value of 576 m or 13,400 li in its current value of exactly 500 m. On average, it measures 6-7 m tall and 4-5 m wide. In April 2009, the State Administration of Cultural Heritage, who used the latest technology degree review the measure and says a length of 8 851.8 km including 6 259.6 kilometers of wall, 359.7 km trench 2 and 232.5 km of natural barriers such as mountains or rivers. The same service was published in June 2012 update of its study, and is now estimated at 21 196.18 km total length of the Great Wall,. The new estimate takes into account the parties are destroyed.
Since 1987, the Great Wall is a World Heritage Site under the number 438
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