I am with meglet. You do not see much of the great wall of china and the question does not really say how high in space? I think that the original idea on this was what you could actually see from the moon, due to the moon landings.
noknowledge - it would be a good idea. not only for your own self respect, but should the US seek to find an excuse to attack another "enemy" they will no doubt, turn an image of your genitals into a threat against their national interests and say that they were displayed in an arrogant fashion to the US people by, say, the North Korean leader. Next thing you know, another war. All because of your genitals.