On 8 March 1421, the largest fleet the world had ever seen set sail from China. The ships, some nearly five hundred feet long, were under the command of Emperor Zhu Di's loyal eunuch admirals. Their orders were 'to proceed all the way to the end of the earth'. The voyage would last for two years and by the time the fleet returned, China was beginning its long, self-imposed isolation from the world it had so recently embraced. And so the great ships were left to rot, and the records of their journey destroyed. And with them, the knowledge that the Chinese had circumnavigated the globe a century before Magellan, reached America seventy years before Columbus, and Australia three hundred and fifty years before Cook. The result of fifteen years research, 1421 is Gavin Menzies' enthralling account of this remarkable journey, of his discoveries and the persuasive evidence to support them: ancient maps, precise navigational knowledge, astronomy, surviving accounts of Chinese explorers and later European navigators as well as the traces the fleet left behind.