Centuriesbeforetheworld'
soceansbecameaglobaltradehighway,Chineseseafarerssetsailtofarawaylandstoexchangecommodities.Now,HistorianSamWillisretracesthegoldeneraofmaritimetradetouncoveralegacythatculminatedinoneofthegreatestarmadasofalltime,anddiscoverparallelsbetweentheworldthenandnow.
