Five hundred years ago, no one suspected the 16th-century vessel the Nao Victoria would become the stuff of legend. In 1519, a Portuguese consul called the Spanish carrack “very old and patched up” and unfit to even “sail … to the Canaries.” Nevertheless, the Nao Victoria was chosen for a five-ship expedition, crewed by 270 men, that would come to be known as one of the most significant journeys in the history of human exploration. The captain of this unprecedented adventure was Portuguese explorer Fernão de Magalhães, anglicized Ferdinand Magellan. On September 20, 1519, he set sail aboard the flagship...