There is a legend that suggests that the great wall of China is visible from space - myth busted. Although it extends for about 8800 kilometers, its width ranges from 5 to 10 meters, making it undetectable from the ISS with the unaided eye.
|I have spent a lot of time looking at the Earth from space, including numerous flights over China, and I never saw the wall|
Jeffrey Hoffman, former NASA astronaut
This is what astronauts see from the ISS:
Actually, the human creation most visible from space is electric lighting. For the Chinese, the fact that the wall is visible from space has been a point of pride for long time. But in 2003, Yang Liwei, China's first man in space, returned from the 14-orbit Shenzhou 5 mission and reported that he had not seen the Great Wall.