Article Photos: Hope and heroism: Obama hails post-9/11 resilience 27/28

  President Barack Obama speaks at "A Concert for Hope" at the Kennedy Center in Washington as the 10th anniversary of the September 11 attacks are observed, Sunday, Sept. 11, 2011. In front of the podium is a limestone angel which broke off the National Cathedral during last month's earthquake. (AP Photo/Charles Dharapak)