@bodhipaksa - Then it replied
Then it replied
"No, and the claim doesn't quite work on any reading of it.
If taken literally, the Great Wall is roughly 9,000+ km from Spain, on the other side of the Eurasian landmass. The curvature of the Earth makes it impossible to see anything that far away from ground level โ the horizon at sea level is only about 5 km out. From Spain, the artificial structures you can see are the ones in Spain (and on a clear day across the Strait, a bit of Morocco).
You're probably alluding to the much more famous version of the myth: that the Great Wall is "the only human-made structure visible from space" or "from the Moon." That one is also false. The Wall is long but quite narrow (typically 4โ9 meters wide) and runs roughly parallel to the surrounding terrain in color, making it very hard to pick out even from low Earth orbit. Chinese astronaut Yang Liwei reported after his 2003 Shenzhou 5 flight that he could not see it, and NASA has discussed this directly โ see their feature "China's Wall Less Great in View from Space". From the Moon, no individual human structure is visible at all; the Earth itself is just a marble. Apollo astronauts have confirmed this (Alan Bean's quote on the matter is widely cited).
Plenty of human works are visible from low orbit under the right lighting โ highways, airports, large reservoirs, greenhouse complexes in Almerรญa (those are in Spain, incidentally), and city lights at night are far more conspicuous than the Wall. Snopes has a decent rundown of the various forms of the myth."
Interestingly its official reply made no mention of my "playful twist".