Filled with wonders, Marco Polo's tales are the first European account of the Silk Road. But, 700 years after the famed Venetian merchant and explorer's death, can they be trusted? Can a man who claimed to have seen a unicorn in the Indonesian island of Sumatra be trusted? This and other similarly valid questions have cast doubt on the truthfulness of Marco Polo since the 14th Century, when his book The Travels of Marco Polo became a bestseller and was translated into dozens of languages, hand-copied in countless manuscripts and available at any lavish court in Europe. Polo's tales are...