One of the Seven Wonders of the World, the Great Wall is an impressive feat of engineering. The Wall is the product of 21 centuries of building and rebuilding that began in the 5th century BC, and was used to protect the Empire of China from Xiongnu attacks. Although sections of the current wall, which dates back to the Ming Dynasty, are in total disrepair, near tourist centers it has been well preserved and even reconstructed to give visitors a glimpse of its former glory.
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