length of the great wall of china in miles
In an archaeological survey that took five years to complete, China's State Administration of Cultural Heritage announced yesterday that the wall measures 21,196.18 km (13,170.69 miles). The Great Wall of China north of Beijing, China. The Great Wall of China is among Seven Wonders of the World.That's considerably longer than the previous mark of 8,850 km (5,500 miles), which was based largely on historical records.The Great Wall was started in 500 BC and first linked up under leader Qin Shi Huang in about 220 BC to protect China's northern border and fend off foreign invaders.he first formal measurement of the world's largest man-made structure revealed the wall was more than twice as long as previous estimates.