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About 10 million
Whether or not it can be seen from outer space, the 4,163-mile-long wall is the world’s longest man-made structure. Though it’s beginning to crumble from the ever-increasing crowds, Badaling, the wall’s most popular strip, welcomes 10 million visitors a year.
For more information: http://arts.guardian.co.uk/news/story/0,11711,1132220,00.html; http://english.people.com.cn/english/200108/13/eng20010813_77155.html(Neither the Chinese Embassy nor the China National Tourist Office can verify this number.)
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