Exploration
In the Pacific Ocean, Jorge de Menezes (c. 1498–?), discovered Papua New Guinea. García Jofre de Loaísa (1490–1526), discovered the Marshall Islands. Explorations of the Americas began with the initial discovery of America by Christopher Columbus (1451–1506), who led a Castilian (Spanish) expedition across the Atlantic, discovering America. After the discovery of America by Columbus, a number of important expeditions were sent out to explore the Western Hemisphere. This included Juan Ponce de León (1474–1521), who discovered and mapped the coast of Florida; Vasco Núñez de Balboa (c. 1475–1519), who was the first European to view the Pacific Ocean from American shores (after crossing the Isthmus of Panama) confirming that America was a separate continent from Asia; Aleixo Garcia (14?–1527), who explored the territories of present-day southern Brazil, Paraguay and Bolivia, crossing the Chaco and reaching the Andes (near Sucre).
Leif Erikson
According to a literal interpretation of Einar Haugen's translation of the two sagas in the book "Voyages to Vinland", Leif was not the first European to discover America: he had heard the story of merchant Bjarni Herjólfsson who claimed to have sighted land to the west of Greenland after having been blown off course. Bjarni reportedly never made landfall there, however. Later, when travelling from Norway to Greenland, Leif was also blown off course, to a land that he did not expect to see, where he found "self-sown wheat fields and grapevines". He next rescued two men who were shipwrecked in this country and went back to Greenland (and Christianised the people there). Consequently, if this is to be trusted, Bjarni Herjólfsson was the first European to see America beyond Greenland, and the two unnamed shipwrecked men were the first people known to Europeans to have made landfall there.