Dias - 1488, sailed around southern tip of Africa
Columbus - 1492, landed in North America (Bahamas)
Vespucci - 1501, sailed to eastern South America
Balboa - 1513, crossed Isthmus of Panama
Magellan - 1519-1522, led first expedition around the world
Cortes - 1521, conquered the Aztecs
Pizarro - 1533, defeated the Inca
(I apologize in advance if any info is wrong. If anything is incorrect, someone please correct me.)