One of Zheng He's ships compared to Columbus' - http://www.angelfire.com/hi5...
"Six centuries ago a towering eunuch named Zheng He commanded the Ming dynasty's fleet of immense trading vessels on expeditions ranging as far as Africa. Almost a century before Christopher Columbus's arrival in the Americas and Vasco da Gama's in India. Even then the European expeditions would seem paltry by comparison: All the ships of Columbus and da Gama combined could have been stored on a single deck of a single vessel in the fleet that set sail under Zheng He." - Ken Morley