The Great Wall photo photo copyrighted by: Galen R. Frysinger The Great Wall is one of the largest building construction projects ever completed. It stretches across the mountains of northern China, winding north and northwest of Beijing. It is constructed of masonry, rocks and packed-earth. It was over 5,000
km (=10,000 Li) long. Its thickness ranged from about 4.5 to 9 meters (15 to 30
feet) and was up to 7.5 meters (25 feet) tall.
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