Events from this date in history, April 21.
753 BC: Romulus founds the city of Rome.
1910: Author and humorist Mark Twain, 74, dies in Redding, Connecticut.
1918: German fighter pilot Manfred Von Richthofen, "Red Baron", is shot down over France and dies at age 25.
1926: Queen Elizabeth II is born Elizabeth Alexandra Mary in Mayfair, London, England.
1934: Daily Mail publishes amateur photo allegedly showing Loch Ness Monster. (It is eventually revealed to be a hoax)
1956: "Heartbreak Hotel", Elvis Presley's first single for RCA Victor, tops the charts at #1.
1962: World's Fair opens in Seattle, Washington with newly built Space Needle taking center stage.
1980: Rosie Ruiz is declared winner in female category of Boston Marathon. She is later stripped of title when it's learned she didn't run the entire course.