Americans gather to celebrate the death of the al-Qaeda leader and mastermind of the Sept. 11, 2001, terrorist attacks.
May 5, 2011 - New YorkPresident Obama lays a wreath at the 9/11 Memorial in New York. Obama took a defiant message to the New York epicenter of the Sept. 11, 2001, attacks, warning that Osama bin Laden's death proved America will never fail to bring terrorists to "justice."Jewel Samad/AFP/Getty Images