Presents biographical sketches of twenty-five significant individuals in the history of world exploration, including Roald Amundsen, Vasco Nunez de Balboa, Robert O'Hara Burke, Richard Burton, Richard Byrd, John Cabot, Jacques Cartier, Christopher Columbus, James Cook, Leif Erikson, Vasco da Gama, Prince Henry the Navigator, Hoei-shin, Mary Kingsley, Rene-Robert Cavelier, Meriwether Lewis, David Livingstone, Alexander Mackenzie, Ferdinand Magellan, Nils Adolf Erik Nordenskiold, Francisco de Orellana, Robert Peary, Marco Polo, Pytheas, and Amerigo Vespucci.