A journey along the greatest land route on earth: out of the heart of China into the mountains of Central Asia, across northern Afghanistan and the plains of Iran and into Kurdish Turkey, Colin Thubron covers some seven thousand miles in eight months. Making his way by local bus, truck, car, donkey cart and camel, he travels from the tomb of the Yellow Emperor to the ancient port of Antioch. The Silk Road is a huge network of arteries splitting and...