On Sept. 11, 2001, New York City's mayor led a city struck by tragedy back from the brink -- from the moment the worst terrorist attacks in U.S. history began. Intimately involved and personally vulnerable, Rudy Giuliani revisits the day he was confronted by the assault on U.S. territory. Having secured unique access, National Geographic takes Giuliani back to moments indelibly marked by horror and heroism -- the story of his personal c
