The Great Wall of China is the longest manmade structure in the world, stretching 21,km (13, miles) long It was built to keep out raiding parties of nomadic tribes, such as the Mongol, Turic and Xiongnu, from modernday Mongolia and Manchuria
The Great Wall of China is the longest manmade structure in the world, stretching 21,km (13, miles) long It was built to keep out raiding parties of nomadic tribes, such as the Mongol, Turic and Xiongnu, from modernday Mongolia and Manchuria