Hope and heroism: Obama hails post-9/11 resilience - Article Photos 19/28

President Barack Obama, right, first lady Michelle Obama, second from right, former President George W. Bush second from left, and former first lady Laura Bush arrive at the National September 11 Memorial for a ceremony marking the 10th anniversary of the attacks at World Trade Center, Sunday, Sept. 11, 2011 in New York. (AP Photo/Mary Altaffer)