In a This Day in History video, host Russ Mitchell takes us through the history of August 13th. On this day in 1521, a Spanish force led by Cortes captured the Aztec capitol now known as Mexico City. Also, on this day in 1942, Walt Disney's Bambi opened in Radio City Music Hall. On this day in 2004, the Olympic Games came home to the place of their birth when the Summer Games opened in Athens, Greece. Also, on this day in 1961, East German soldiers split Berlin; in time, Berlin became two separate nations and its wall became one of the most prominent symbols of the Cold War.