A section of the Great Wall of China just north of Beijing. The wall was begun in the 7th century BCE and significantly extended by the Ch'in emperor Qin Shi Huangdi from 220 to 210 BCE.
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Original image by Steve Webel. Uploaded by Mark Cartwright, published on 28 October 2012 under the following license: Creative Commons: Attribution-NonCommercial-ShareAlike. This license lets others remix, tweak, and build upon this content non-commercially, as long as they credit the author and license their new creations under the identical terms.