It’s a quiz-master’s favourite: which is the only manmade object visible from orbit/space/the moon? To which we all know the answer: the Great Wall of China. That makes sense too, because it’s huge, right?
THE REALITY
The dull reality is that whether the Great Wall of China is visible or not depends on the distance you’re viewing from, the atmospheric conditions, whether you’re viewing with the naked eye and, of course, if you’re orbiting the right part of the world at the time!
It’s certainly not visible with the naked eye from the moon, as confirmed by Neil Armstrong, who could see continents and lakes during his 1969 lunar walk but no manmade structures.