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The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to Stock Photo - Alamy
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Close-up view of the masonry of the Great Wall of China] - PICRYL - Public Domain Media Search Engine Public Domain Search
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The Great Wall of China: bricks with date and code from the armies that made them. | Great wall of china, Greatful, Photo facts
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