1. Christopher Columbus - Italian explorer who reached the Americas in 1492.
2. John Cabot - Italian explorer who landed in North America in 1497.
3. Vasco da Gama - Portuguese explorer who discovered the sea route to India in 1498.
4. Ferdinand Magellan - Portuguese explorer who led the first circumnavigation of the Earth from 1519 to 1522.
5. Juan Ponce de León - Spanish explorer who discovered Florida in 1513.
6. Hernán Cortés - Spanish explorer who conquered the Aztec Empire in Mexico from 1519 to 1521.
7. Francisco Pizarro - Spanish explorer who conquered the Inca Empire in Peru from 1532 to 1533.
8. Jacques Cartier - French explorer who discovered Canada in 1534.
9. Samuel de Champlain - French explorer who founded Quebec City in 1608.
10. Henry Hudson - English explorer who explored the Hudson River and Hudson Bay in 1609 and 1610.
11. John Smith - English explorer who helped found the Jamestown colony in North America in 1607.
12. William Baffin - English explorer who explored the Arctic Ocean in the early 17th century.
13. Abel Tasman - Dutch explorer who discovered Tasmania and New Zealand in the 17th century.
14. James Cook - British explorer who made three voyages to the Pacific Ocean in the 18th century and made significant contributions to cartography.
15. David Livingstone - Scottish explorer who explored Africa in the 19th century.
16. Henry Morton Stanley - Welsh-American explorer who explored Africa in the 19th century and found David Livingstone.
17. Robert Peary - American explorer who reached the North Pole in 1909.
18. Roald Amundsen - Norwegian explorer who reached the South Pole in 1911.
19. Edmund Hillary - New Zealand explorer who, along with Tenzing Norgay, was the first person to reach the summit of Mount Everest in 1953.
20. Yuri Gagarin - Soviet cosmonaut who was the first person to travel into space in 1961.