The Great Wall (China). The Great Wall is as long as 8,850 kilometers. Built in 475 BC and reconstructed in the Ming Dynasty (1368 – 1644), the Great Wall was added with towers, battlements, artillery in the make-over, which are even up to 980 meters above sea level. You cannot imagine that the adhesive material for cement stone was actually glutinous rice flour. Completion time is 204 BC. (Source: people.com.cn) |