There was never one Silk Road - but several. The route chosen by Colin Thubron passes through China, Uzbekistan, Kyrgyzstan, Afghanistan, Iran and Turkey, taking in the most sterile desert on earth (the Taklamakan) and the strife-torn mountain valleys of today`s conflicts, as he travels from the tomb of the Yellow Emperor (the mythic progenitor of the Chinese people) to the ancient port of Antioch, by local bus, truck, car - occasionally Landrover, horse or camel. He covers 7,000 miles in 8 months, and confesses that it is the most difficult, complex and ambitious journey he has undertaken in 40 years of travel, The Silk Road is a huge network of arteries and veins, splitting and converging across the breadth of Asia. Chinese silk has turned up in the hair of a 10th-century-BC Egyptian mummy; equally, the tartan plaids of 3000-year-old mummies in the Chinese desert echo those of early Celts. To be travelling the Silk Road, writes Colin Thubron, is to be travelling the history of the world: tracing the passage not just of trade and armies, but of ideas, religions and inventions. Yet - despite the lure of the history - this book is as much about Asia today. Its themes include different Islams (oppressed in China; fervent in Afghanistan and Iran; cautiously monitored in Uzbekistan); contrast (no cities could be more different than ancient Samarkand and modern Teheran); and the way that today`s borders are meaningless because the true boundaries are made by tribe, ethnicity, language and religion.