Great Wall of China

The Great Wall of China is not, as is claimed, the only human-made object visible from the Moon or from space. None of the Apollo astronauts reported seeing any specific human-made object from the Moon, and even earth-orbiting astronauts can barely see it. City lights, however, are easily visible on the night side of earth from orbit. Shuttle astronaut Jay Apt has been quoted as saying that "the Great Wall is almost invisible from only 180 miles (290 km) up." ISS commander Chris Hadfield attempted to find it from space, but said that it was "hard as it's narrow and dun-colored."