Great Wall of China not visible from space

A Chinese astronaut has said that no, the Great Wall is not visible from space. I remember being told that it was visible from space when I was a kid. California water people came and told my grade school class that only two manmade things are visible from space, the Great Wall of China and the California Aquaduct. I guess the thing about the aquaduct's a lie too. Liars, shattering a young boy's dream! I'll give them somethin' that's visible from space!!! Like weapons! How `bout that?