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Work on the wall started in 500 BC during the rule of the first Chinese emperor, [[Qin Shi Huang]], and continued for 2,000 years. Most of the work was done during the [[Ming Dynasty]]. At regular intervals towers were built; at first they functioned purely as watchtowers but later on they were modified to include [[cannon]]s and defenses against aerial attacks.
 
Work on the wall started in 500 BC during the rule of the first Chinese emperor, [[Qin Shi Huang]], and continued for 2,000 years. Most of the work was done during the [[Ming Dynasty]]. At regular intervals towers were built; at first they functioned purely as watchtowers but later on they were modified to include [[cannon]]s and defenses against aerial attacks.
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A long-standing legend holds that the Great Wall of China is the only [[human|man-made]] structure visible from space, or even that it is visible from the [[Moon]].  This legend probably originated with [[Richard Halliburton]]'s 1938 "Second Book of Marvels," which made this claim. In fact, it has been disputed whether it is even visible to the naked eye from low earth orbit. Some [[astronaut]]s have looked for it and have been able to see it, some have not. In 2005 an [[American]] astronaut (of [[Chinese]] descent) did succeed [[photograph]]ing it. <ref> [http://news.bbc.co.uk/1/hi/world/asia-pacific/4459311.stm BBC News report of "China Daily" article 4/19/2005]</ref> There is no truth to the notion that there are ''few'' visible human structures; Cecil Adams comments:
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A long-standing legend holds that the Great Wall of China is the only [[human|man-made]] structure visible from space, or even that it is visible from the [[Moon]].  This legend probably originated with [[Richard Halliburton]]'s 1938 "Second Book of Marvels," which made this claim. In fact, it has been disputed whether it is even visible to the naked eye from low earth orbit. Some [[astronaut]]s have looked for it and have been able to see it; some have not. In 2005 an [[American]] astronaut (of [[Chinese]] descent) did succeed [[photograph]]ing it. <ref> [http://news.bbc.co.uk/1/hi/world/asia-pacific/4459311.stm BBC News report of "China Daily" article 4/19/2005]</ref> There is no truth to the notion that there are ''few'' visible human structures; Cecil Adams comments:
    
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