Skyscraper times a billion

I don't know how many man-made objects can be seen from space, mostly because I've never been there. I'm pretty sure the Great Wall of China is the only one, because the other possibilities have involved someone calling the person who said it an idiot. But I'm pretty sure that this could be seen from space, since it would actually go from earth to space. If they could pull this off it would probably be one of the greatest feats of human engineering of all time, and just the possibility of seeing it happen in our lifetimes is kinda cool.