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On September 11, 2001 there was terrorist attack on the United States. Four planes were hijacked. Two planes hit the Twin Towers and the other landed in a field in Pennsylvania. The last plane crashed into the Pentagon at 9:37:46 am, American Airlines Flight 77, killing 58 passengers on the plane, 4 flight attendants, 2 pilots and 125 workers and military workers were killed. Even though part of the building they worked in was burning and had just been hit by a plane some people working at the Pentagon didn't even know something was wrong. Although many died many were saved because of the design of the Pentagon. This was a major tragedy in U.S. history. As it says on http://www.pentagonmemorial.net/learn/911-pentagon " The events of September 11, 2001 are forever etched into the hearts and souls of the family members and loved ones of those who died, our nation, and the world." All this is true and is the reason for the building of the Pentagon Memorial.