What was it like to be in the north tower of the World Trade Center when it was hit by American Airlines Flight 11? How did it feel to be the president on September 11, 2001? What was it like to be a witness to history? Revisit the day the world changed: September 11, 2001. Discover what it was like to see the twin towers crumble against the New York skyline. Find out how it felt to be a firefighter called to action when the Pentagon was hit. Read Afghan-American Mir Tamim Ansary's e-mail, and hear how it changed the view of Americans all over the United States.