The great wall was constructed during the reign of Qin, Han, and Ming Dynasties. Chinese great wall is one the famous wonder of the world, the wall is just like gigantic dragon, it covers wide world area of the world which crosses the lush green mountains, deserts, plateaus and grass land. The Great Wall was listed as a World Heritage by UNESCO in 1987., stretching approximately 8,851.8 kilometers (5,500 miles) from east to west of China. With a history of more than 2000 years, the objective of the wall is to defend the three state, we may called it the fort for kings of the state. Emperor Qin Shihuang succeed in his effort to join the wall together to fend off the invasion from Huns in the north, some of the sections are now in ruins or have disappeared. However, it is still one of the mostappealing attractions all around the world owing to its architectural grandeur and historical significance. The great wall is made of stone, brick, tamped earth, wood, and other materials; it is constructed along an east to west line across the historical northern borders of china to protect the other empires of the china.
The mystery of the construction of the wall is amazing. The construction, which drew heavily on the local resources for construction materials, was carried out in-line with the local conditions under the management of contract and responsibility system. A great army of manpower, composed of soldiers, prisoners and local people, built the wall. For the construction of the great wall the king of the Dynasty used his army, people and meson from different parts of the china, use large quantity of material which are required forconstruction was difficult, so builders always tried to use local resources. Stones from the mountains were used over mountain ranges, while rammed earth was used for construction in the plains. Other purposes of the Great Wall have included border controls, allowing the imposition of duties on goods transported along the silk rout, regulation or encouragement of trade and the control of immigration and emigration. Furthermore, the defensive characteristics of the Great Wall were enhanced by the construction of watch towers, troop barracks, garrison stations, signaling capabilities through the means of smoke or fire, and the fact that the path of the Great Wall also served as a transportation corridor.The construction result demonstrates the wisdom and tenacity of the Chinese people.
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