this is the great wall of china. The Great Wall of China stretches more than 6,400 kilometers, or nearly 4,000 miles through northern China. China's first emperor, Qin Shi Huang, began constructing the wall in the 3rd century BC to protect the northern borders of his empire.

the Great Wall has been eroded, built, rebuilt and extended many times.Construction of the Great Wall began in the 7th Century BC when China was controlled by feudal warlords. It was joined together (along with China) in the Qin Dynasty (221-206 BC). Added to and rebuilt until the 16th Century, the Great Wall's purpose was to protect the northern borders of the Chinese Empire from invaders