Flight 93 National Memorial (U.S. National Park Service)
(Photo credit: Nicholas Kamm/AFP/Getty Images)
US President Barack Obama pays his respects with his wife Michelle after laying a wreath at the Wall of Names during a ceremony marking the tenth anniversary of the September 11, 2001 attacks at the newly dedicated Flight 93 memorial at the site where the United plane crashed, in Shanksville, Pensylvania, on September 11, 2011.