And this for many reasons. First, a large number of human constructions are visible from space such as cities or famous roads that astronauts regularly share clichés. The Great Wall is therefore not “the only” building built by Man visible from space.
But moreover, oh surprise, the great wall is in fact itself not visible by the human eye! If the photographs taken by NASA’s advanced satellites make it possible to distinguish the shape of the wall, it is impossible to distinguish it with the naked eye: the wall is imposing in length but too thin to be perceived at a distance so far . In addition, it is made of a material whose color blends into the surrounding decor over most of its journey, making it even more difficult to perceive.