BBC: China ends Great Wall space myth (12-Mar-04)
China is changing official thinking about a common misconception relating to its best-known ancient site. For decades, elementary schoolbooks have maintained that the Great Wall of China could be seen from space – but now the books are being rewritten. The Wall, China now admits, cannot in fact be seen from the heavens – a fact proved by China’s own astronaut Yang Liwei, who became the country’s first person in space last year.

…Which is pretty odd, because, when I was on the Great Wall of China, I could definitely see space.