http://www.history.com/photos/9-11-pentagon On September 11, 2001 a hijacked plane crashed into the side of the Pentagon. Another flight, United 93, crashed into a field in Pennsylvania. en Copyright 2013, History.com Sun, 19 May 2013 04:00:00 GMT History.com 2013-05-19T04:00:00Z en Copyright 2013, History.com http://www.history.com/photos/9-11-pentagon/photo1 The Pentagon, looking northeast with the Potomac River and Washington Monument in the distance. http://www.history.com/photos/9-11-pentagon/photo1 http://www.history.com/photos/9-11-pentagon/photo2 The Pentagon surrounded by smoke and flames, showing the damage of the terrorist attacks of 9/11. http://www.history.com/photos/9-11-pentagon/photo2 http://www.history.com/photos/9-11-pentagon/photo3 The Pentagon was heavily damaged after a hijacked commercial airliner crashed into the southwest corner of the building on September 11, 2001. http://www.history.com/photos/9-11-pentagon/photo3 http://www.history.com/photos/9-11-pentagon/photo4 Emergency workers and firefighters worked through the night searching for survivors. http://www.history.com/photos/9-11-pentagon/photo4 http://www.history.com/photos/9-11-pentagon/photo5 A rescue helicopter uses Washington Boulevard outside the Pentagon to evacuate injured personnel after the terrorist attack on the building on September 11, 2001. http://www.history.com/photos/9-11-pentagon/photo5 http://www.history.com/photos/9-11-pentagon/photo6 Medical personnel and volunteers help injured people outside the Pentagon on September 11, 2001. http://www.history.com/photos/9-11-pentagon/photo6 http://www.history.com/photos/9-11-pentagon/photo7 U.S. President George W. Bush and Secretary of Defense Donald Rumsfeld visit the Pentagon to view the damage the day after the September 11, 2001, terrorist attacks. http://www.history.com/photos/9-11-pentagon/photo7 http://www.history.com/photos/9-11-pentagon/photo8 Firefighters and soldiers unfurl a large American flag over the side of the Pentagon during rescue and recovery efforts. http://www.history.com/photos/9-11-pentagon/photo8 http://www.history.com/photos/9-11-pentagon/photo9 Smoke rises behind investigators as they comb the crater left by the crash of United Airlines flight 93 near Shanksville, Pennsylvania September 12, 2001. Flight 93 is one of four planes that were hijacked as part of a deadly and destructive terrorist plot against the U.S. September 11. http://www.history.com/photos/9-11-pentagon/photo9 http://www.history.com/photos/9-11-pentagon/photo10 A memorial stands on the hill overlooking the area where United Flight 93 crashed in rural Pennsylvania near Shanksville. The memorial has pictures of Deborah Jacobs-Welsh, one of the victims of Flight 93. http://www.history.com/photos/9-11-pentagon/photo10 http://www.history.com/photos/9-11-pentagon/photo11 First Lady Laura Bush speaks at a memorial service for victims of United Flight 93 on September 17, 2001. Hundreds of family members of the victims from all over the country were present. The plane was hijacked on September 11 and crashed in Pennsylvania when the passengers chose to fight the hijack http://www.history.com/photos/9-11-pentagon/photo11 http://www.history.com/photos/9-11-pentagon/photo12 In the woods behind her home, about six miles from the crash site of United Flight 93, Melanie Hankinson of New Baltimore found several pieces of charred paper that she believes drifted through the air after the crash. http://www.history.com/photos/9-11-pentagon/photo12 http://www.history.com/photos/9-11-pentagon/photo13 At the foot of a tree located opposite the charred Pentagon building days after the September 11th attacks children have made a makeshift memorial. Patriotism was incredibly strong in the days and weeks following 9/11 as the country united around the crisis. http://www.history.com/photos/9-11-pentagon/photo13 http://www.history.com/photos/9-11-pentagon/photo14 Two sisters drape themselves in an American flag while attending a 9/11 vigil. The informal memorial was one of thousands across the U.S. that were created following the September 11 terror attacks on the World Trade Centers in New York City and the Pentagon in Washington, D.C. http://www.history.com/photos/9-11-pentagon/photo14 http://www.history.com/photos/9-11-pentagon/photo15 Circling the base of the Washington Memorial in Washington DC, American flags fly at half-mast in the week after the September 11th attacks. http://www.history.com/photos/9-11-pentagon/photo15 http://www.history.com/photos/9-11-pentagon/photo16 The 19 hijackers who took control of four commercial airplanes and crashed them into the World Trade Center and the Pentagon. http://www.history.com/photos/9-11-pentagon/photo16 http://www.history.com/photos/9-11-pentagon/photo17 A monitor for United Airlines announces the cancellation of flights in and out of the San Francisco International Airport on September 11, 2001. http://www.history.com/photos/9-11-pentagon/photo17