The Ground Zero wreckage.Porter Gifford: Corbis via Getty ImagesA picture of the Pentagon’s emergency response to the day’s attacks. Released March 23, 2017 FBIFBI team at the Pentagon. The FBI released this photo March 23, 2017Interior of the Pentagon. Released March 23, 2017Pentagon emergency Response. Released March 23, 2017. FBIPentagon exterior. Released March 23, 2017.debris from the airplane that struck the Pentagon. Released March 23, 2017First Responders. Frank Fournier, Untitled, 2001. New-York Historical SocietyFred George, Ash Wednesday, Dusk, 9:12:01, New-York Historical SocietyMicah, a German Shepherd from Connecticut, rests under the shade of a dog biscuit box in a firehouse opposite the World Trade Center after a 20-hour day spent searching fruitlessly for survivors amidst the wreckage . Getty ImagesMemento Mori. Alice Attie, 2001. New-York Historical SocietyFirefighters raise a U.S. flag at the site of the World Trade Center after two hijacked commercial airliners were flown into the buildings September 11, 2001 in New York. (Photo by 2001 The Record (Bergen Co. NJ)/Getty Images)
