On Land (Round 2)
Hillary: Polo's years in service of the Kublai Khan may have given Europeans easier access to spices and silks (and kids' swimming pool games), but Hillary took us to the rooftop of the world. The fact that he so humbly refused to say he summited first until after Tenzing Norgay died is gravy.
Lewis and Clark: Moses may have had God on his side, but L&C had Sacagawea, who probably came in handier in interactions with Western Indians. Although they didn't part any seas, they did miraculously lose just one man during their entire voyage, and that was due to appendicitis.