Once Upon a Time... The Explorers

At the end of the 13th century, the Venitian traveller Marco Polo was amazed to see, in China, huge 5-masted junks with sails of red silk and crews of 300 men. But these vessels that so impressed him were merely the forerunners of what was to become, in less than two centuries, the most astonishing of fleets ever to sail the seas.