The Great Wall, like the Pyramids of Egypt, the Taj Mahal(1) in India and the Hanging Garden of Babylon(2), is one of the great wonders of the world. Starting out in the east on the banks of the Yalu River in Liaoning Province, the Wall stretches westwards for 12,700 kilometers to Jiayuguan in the Gobi desert, thus known as the Ten Thousand Li Wall in China. The Wall climbs up and down, twists and..