PHOTOS: September 11th Remembrance Ceremonies

<div class="meta image-caption"><div class="origin-logo origin-image ap"><span>AP</span></div><span class="caption-text">A visitor pays tribute to the passengers and crew of Flight 93 at the Flight 93 National Memorial in Shanksville, Pa, Sunday, Sept. 11, 2016. (AP Photo/Jared Wickerham)</span></div>
The U.S. marked the 15th anniversary of 9/11 on Sunday, with victims' relatives reading their names and reflecting on a loss that still felt as immediate to them as it was indelible for the nation.
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