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Visible from Space, The Great Wall of China is the largest man-made feature on the planet, however, contrary to popular legend (and according to astronauts Neil Armstrong, Jim Lovell and Jim Irwin) it is not visible from the moon.The Great Wall is 6' 700 kilometers in length, running east to west and crossing five provinces.

For thousands of years, the ancient Chinese thought they were pretty much alone on the planet Earth. They knew there were people to the north, - the Mongols - but they did not know that other advanced ancient civilizations existed anywhere else.