China Great Wall

In c. 220 B.C., under Qin Shi Huang, sections of  initial fortifications were joined together to kind a united weaponry against invasions from the north. Construction carried on up to the sept|dynasty} dynasty (1368–1644), when the nice Wall overtook the world's greatest military construction. Its historic and strategic importance is matched only by its field significance.
The Great Wall was unceasingly engineered from the third century B.C. to the seventeenth century AD on the northern border of the country because the nice military defence project of serial Chinese Empires, with a total length of over 20,000 kilometers. The Great Wall begins within the east at Shanhaiguan in Hebei province and ends at Jiayuguan in province to the west. Its main body consists of walls, horse tracks, watch towers, and shelters on the wall, and covers fortresses and passes through the Wall.
The Great Wall reflects collision and exchanges between agricultural civilizations and mobile civilizations in ancient China. It provides significant physical proof of the far-sighted political planned and mighty military and national defence forces of central empires in ancient China, and is an outstanding example of the very good military design, technology and art of ancient China. It embodies unparalleled significance as the national image for safeguarding the safety of the country and its individuals.
 The Great Wall of the Ming is, not only as a result of of the formidable character of the enterprise however conjointly the perfection of its construction, complete masterpiece. The  just work engineered by human hands on this planet which will be seen from the moon, the Wall constitutes, on the wide scale of a continent, a perfect example of design integrated into the landscape.
 During the Chunqiu amount, the Chinese imposed their models of construction and organization of area in building the protection works on the northern frontier. The spread of Sinicism was accentuated by the population transfers necessitated by the nice Wall. That the Great Wall bear exceptional testimony to the civilizations of ancient China is illustrated the maximum amount by the rammed-earth sections of fortifications qualitative analysis from the Western dynasty that area unit preserved within the province as by the admirable and universally acclaimed masonry of the Ming amount.