National September 11 Memorial & Museum world trade center
National September 11 Memorial Hall and Museum prepares to open
The National September 11 Memorial Museum stands beyond the north reflecting pool during the opening ceremony for the museum at ground zero May 15, 2014 in New York City. (Justin Lane—Getty Images)
Patrick Mate Lyons, son of firefighter Lt. Patrick Lyons who died on Sept. 11, 2001, speaks in St. Patrick's Cathedral in New York Saturday, Sept. 10, 2011, during a ceremony to honor New York firefighters who were killed ten years ago in the attacks on the World Trade Center. (AP Photo/Brian Snyder, Pool)
Northern Pool, National September 11 Memorial & Museum, Lower Manhattan, New York, USA