Columbus day celebrates the day that Christopher Columbus arrived in the Americas, on October 12, 1492.
The United States, the Bahamas, Spain, Argentina, Uruguay, and many other Latin American countries celebrate some form of Columbus Day, and have since the late 18th century.
The idea that Columbus wanted to sail West from Europe to India to prove that the Earth was round is an idea that was popularized by Washington Irving's biography of Columbus. Since the time of Aristotle in the 4th century BC most educated people accepted that the world was not flat.
Columbus made four voyages from Spain to the Americas, never making it further north than the Bahamas and Cuba.
Who is your favorite explorer?