(Photo: Amy Dreher)
NYPD officers place flowers on the names of those officers who died on 9/11. (Photo: Jin Lee)
A 9/11 Memorial Museum volunteer assists visitors on the plaza. (Photo: Amy Dreher)
Former U.S. Navy SEAL Team 6 member Robert O'Neill stands in front of the shirt he wore during Osama bin Laden's death, on display in the 9/11 Memorial Museum. (Photo: Jin Lee)
Defense Secretary Ash Carter places a wreath on the 9/11 Memorial. (Photo: Jin Lee)
The Timescape in the 9/11 Memorial Museum. (Photo: Jin Lee)

A Look Back at the 2015 Memorial 5K

Participants cross the finish line at the 2015 9/11 Memorial 5K Run/Walk event. (Photo: Jin Lee)
(Photo: Jordan Friedman)
The Survivor Tree on the 9/11 Memorial plaza. (Photo: Jin Lee)
(Photo: Courtesy of Port Authority of New York and New Jersey)