books.google.mn - It is arguably the greatest feat of civil engineering in history, and indisputably earth’s largest single cultural relic: begun during the Qin Dynasty (around 208 BC) and completed nearly 1,800 years later during the Ming Dynasty, the Great Wall of China spans more than 4,000 miles. At the dawn of...http://books.google.mn/books/about/The_Great_Wall.html?id=iahOv0GtXQUC&utm_source=gb-gplus-shareThe Great Wall
