The great wall of ChinaThe great wall of China is located on the northern border of China. The default created in the era of Qin dynasty (c. 322-337 in or 221-206 years before Christ), with the aim to link the fortress, one to prevent invasions from Mongol tribes in the past. With over 6700 km in length and is considered by human construction, the longest in the world ever. How many thousands of people must devote their lives to the construction of this huge. In addition, he has already has said that the great wall of China is the only building in the world that can be seen from outer space. The great wall of China has been chosen by UNESCO as a world heritage site when 2529 (1986)
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