Great Wall Powerpoint

The Great Wall of China was built between the 3rd century BC and 17th century AD to protect China from northern invaders like the Mongols. It stretches over 5,500 miles across northern China from the Gobi Desert to the Yellow Sea. While it is visible from space, some claims that it can be seen from the moon are untrue. Excessive tourism is damaging some sections of the wall but it still brings valuable tourism revenue to China.