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 the Beijing Olympics, the eyes of all the world are upon it.Two men who navigated every inch of the Wall have collaborated on a lavishly-illustrated tribute...