Visible from Space, The Great Wall of China is the largest man-made feature on the planet, however, contrary to popular legend (and according to astronauts Neil Armstrong, Jim Lovell and Jim Irwin) it is not visible from the moon.
The Great Wall is 6’700 kilometers in length, running east to west and crossing five provinces. Appearing as a long, serpentine dragon, it winds across lands including deserts, grasslands and even mountains. Every type of material available at the time was used. From mud and reeds, to the finest mortar bricks ever made. ( still intact centuries later )