The Great Wall (UNESCO/NHK)

In c. 220 B.C., under Qin Shi Huang, sections of earlier fortifications were joined together to form a united defence system against invasions from the north. Construction continued up to the Ming dynasty (1368--1644), when the Great Wall became the world's largest military structure. Its historic and strategic importance is matched only by its architectural significance.

Source: UNESCO TV / © NHK Nippon Hoso Kyokai
URL: http://whc.unesco.org/en/list/438/

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