abscondo

Yep. What's untrue is that the Great Wall is the only man-made object visible from space. There are others as well, none of which come to mind at the moment.

Oh, ok, I spent the 30 seconds required to Google it ... and it turns out there are many. You can see some here.

As usual, Snopes has a good explanation, including the fact that this canard dates back to at least the 1930s.

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Ceci n'est pas une pipe.