his Presidents' Day, popular Travel Channel Series "Mysteries at the Museum" will air back-to-back episodes overflowing with surprising new details and little-known facts about the nation's most notable leaders. Hosted by Don Wildman, the 16-hour programming event, airing on Thursday, February 15 from 2-11 p.m. ET/PT and Sunday, February 18 from 11 a.m.- 4 p.m. ET/PT, will include stories ranging from the catastrophe that nearly befell Jaqueline Bouvier's iconic wedding dress to President Reagan's role in discovering Norma Jeane Dougherty, who later became Hollywood icon Marilyn Monroe, and President Carter's 1969 UFO sighting.