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The Great Wall, Jinshanling, China

The Great Wall, Jinshanling, China

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CHENGDE, CHINA - AUGUST 20: (CHINA OUT) A general view shows part of the Jinshanling section of the Great Wall with cloud around on August 20, 2015 in Chengde, Hebei Province of China. (Photo by VCG/VCG via Getty Images)

CHENGDE, CHINA - AUGUST 20: (CHINA OUT) A general view shows part of the Jinshanling section of the Great Wall with cloud around on August 20, 2015 in Chengde, Hebei Province of China.  (Photo by VCG/VCG via Getty Images)

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Elderly man pushing bicycle along Great Wall

Elderly man pushing bicycle along Great Wall

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China, View of Great Wall

China, View of Great Wall

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Great Wall of China

Great Wall of China