Built between the 5th century B.C. and the 16th century, the Great Wall of China is a stone-and-earth fortification created to protect the borders of the Chinese Empire from invading Mongols. The Great Wall is actually a succession of multiple walls, stretching approximately 13,170 miles (21,196 kilometers) from east to west of China., making it the world's longest manmade structure.
Present Condition
Great Wall of China