The Great Wall is one of the largest building construction projects ever completed. It stretches across the mountains of northern China, north and northwest of Beijing. It is constructed of masonry 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.
During the Ming Dynasty (1368-1644), the Great Wall was enlarged to 6,400 kilometers (4,000 miles) and renovated over a 200 year period, with watch-towers and cannons added. It stretches from the Jiayu Pass (in Gansu Province) in the west, to the mouth of the Yalu River (in Liaoning Province) in the east.
The Great Wall can be seen from Earth orbit, but is not visible from the moon, according to astronauts Neil Armstrong, Jim Lovell, and Jim Irwin.
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