"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." -http://whc.unesco.org
Postcard 1
Thank you so much Guan for sending me this postcard! =)
Postcard 2
Card received for RR on Postcrossing Forum...
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