On this day in 2001, nineteen (19) militants associated with the terrorist group al-Qaeda hijacked four planes in the United States and attacked the World Trade Center in New York City and the Pentagon in Washington, D.C. The fourth plane crashed in a field in Shanksville, PA after passengers defended it against the hijackers.
The PENTAGON. What you may not know is that on September 11, 1941, 60 years earlier on this same day, construction began on the Pentagon in Arlington, Virginia.
It is one of the largest office buildings in the world, and it is the headquarters of the U.S. Department of Defense, including the ARMY, NAVY, and the AIR FORCE.