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Proba seems the Great Wall of China from space
"When Yang Liwei, the first taikonaut, orbited 14 times around Earth in October 2003, he didn't see the Great Wall of China from his Shenzhou V capsule. He was disappointed, and so were his countrymen. China said for decades that the Great Wall was the only manmade object visible from space. So, the Chinese government was tempted to modify the schoolbooks to remove this reference.

But now, Proba, the polyvalent satellite launched in 2001 by the European Space Agency (ESA), was able to capture images of the Great Wall from space taken at an altitude of 600 km."

Here it is.

(source:Source: European Space Agency news release, May 11, 2004)