Columbus
Columbus
http://www.win.tue.nl/~engels/discovery/columbus.html
De ontdekkingsreizigers
Discoverers web. contains many links on explorers and discoverers and their voyages, as well as some internal pages.
http://www.win.tue.nl/~engels/discovery/
Marco Polo
Silkroad foundation
http://www.silk-road.com/artl/marcopolo.shtml