two things that make the Great Wall engineering marvel are
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1. With a total length of 21,196.18 km (13,170.70 miles), equal to half the length of the Equator, the Great Wall of China is the longest feat of human engineering.
2. In the main today’s wall comprises relics from the Ming Dynasty (1368 - 1644), measuring 8,851.8 km (5,500 miles).
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