David Muir/ABC News
  • "The Survivor Stairs" connected the World Trade Center Plaza to the street used by hundreds even after the South Tower fell.
    David Muir/ABC News
  • A poster made shortly after 9/11 plays off the longtime New York state campaign "I Love NY."
    David Muir/ABC News
  • The last column standing. It quickly became a memorial to the first responders lost on 9/11.
    David Muir/ABC News
  • A truck from the FDNY’s Ladder 3, which helped civilians escape the North Tower. Ladder 3 lost 11 men.
    David Muir/ABC News
  • The cover of the NY Post the morning of Primary Day in NYC before the events of 9/11 began.
    David Muir/ABC News
  • The 1 WTC sign saved from the wreckage.
    David Muir/ABC News
  • Todd Beamer's watch was found in the field of Shanksville, Pennsylvania. He was one of the heroes who took Flight 93 back from the hijackers.
    David Muir/ABC News
  • A bike rack recovered from outside the Twin Towers holds helmets.
    David Muir/ABC News
  • An American flag recovered from the World Trade Center site.
    David Muir/ABC News
  • An FDNY ambulance was recovered from the WTC site with its burned-out door after the towers collapsed.
    David Muir/ABC News
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PHOTO: Left, Sabrina Allen, 4, is shown in this photo provided by the National Center for Missing and Exploited Children; right, Sabrina Allen, 17, is seen in this undated handout photo.
National Center for Missing and Exploited Children|Courtesy of PI Phillip Klein
Kelly Ripa
Seth Poppel/Yearbook Library
PHOTO: Earths moon is pictured as observed in visible light, left, topography, center, and the GRAIL gravity gradients, right.
NASA/GSFC/JPL/Colorado School of Mines/MIT
PHOTO: A long-distance bus station is filled with passengers at the start of Golden Week on Oct. 1, 2014 in Zhengzhou, China.
ChinaFotoPress/ChinaFotoPress via Getty Images