Hijacked United Airlines Flight 175 from Boston crashes into the south tower of the World Trade Center and explodes at 9:03 a.m. on September 11, 2001. (Photo by Spencer Platt/Getty Images)
25 Iconic 9/11 Images
25 Iconic 9/11 Images
25 Iconic 9/11 Images
Firemen leave the rescue area near the World Trade Center after their shift. (credit: ROBERTO SCHMIDT/AFP/Getty Images)
25 Iconic 9/11 Images
25 Iconic 9/11 Images
25 Iconic 9/11 Images
25 Iconic 9/11 Images
25 Iconic 9/11 Images
25 Iconic 9/11 Images
25 Iconic 9/11 Images
25 Iconic 9/11 Images
Smoke Pours From The World Trade Center After Being Hit By Two Planes September 11, 2001 In New York City. (Photo By Craig Allen/Getty Images)
25 Iconic 9/11 Images
New York City firefighters look at the destroyed facade of the World Trade Center September 13, 2001 two days after the twin towers were destroyed when hit by two hijacked passenger jets. (Photo by Chris Hondros/Getty Images)
25 Iconic 9/11 Images
An unidentified New York City firefighter walks away from Ground Zero after the collapse of the Twin Towers September 11, 2001. (Photo by Anthony Correia/Getty Images)
25 Iconic 9/11 Images
Rescue workers survey damage to the World Trade Center September 11, 2001. (Credit: Doug Kanter/AFP/Getty Images)
25 Iconic 9/11 Images
A US flag flies from a television antenna September 13, 2001 amid the rubble of the World Trade Center after an aircraft crashed into it September 11 as part of a terrorist attack. The antenna was once at the top of one of the 110 story twin towers. (Photo by FEMA/Getty Images)
25 Iconic 9/11 Images
A New York City fireman calls for 10 more rescue workers to make their way into the rubble of the World Trade Center September 14, 2001 days after the September 11, 2001 terrorist attack. (U.S. Navy Photo by Jim Watson/Getty Images)
25 Iconic 9/11 Images
This photo shows Edward Fine covering his mouth as he walks through the debris after the collapse of one of the World Trade Center Towers on 9/11/01. Fine was on the 78th floor of 1 World Trade Center when it was hit by a hijacked plane. (Credit: Stan Honda/AFP/Getty Images)
25 Iconic 9/11 Images
A man with a fire extinguisher walks through rubble after the collapse of the first World Trade Center Tower (Credit: Doug Kanter/AFP/Getty Images)
25 Iconic 9/11 Images
NYPD police officer Ken Radigan rubs his eyes after briefly sleeping in a pew at St. Paul's Episcopal Chapel, near the site of the World Trade Center attack, September 21, 2001. The chapel served as a relief area for rescue workers. (Photo by Mario Tama/Getty Images)
