The September 11, 2001 (9/11) terrorist attacks occurred in several key locations in the United States:
- Two hijacked planes were flown into the Twin Towers of the World Trade Center in New York City, causing their collapse
- A third plane, American Airlines Flight 77, crashed into the Pentagon, the headquarters of the U.S. Department of Defense, located in Arlington County, Virginia
- The fourth plane, United Airlines Flight 93, crashed in a rural field near Shanksville, Pennsylvania, after passengers attempted to regain control from the hijackers. Its intended target was believed to be either the U.S. Capitol or the White House
These coordinated attacks resulted in the deaths of nearly 3,000 people and significant destruction at these sites
. Memorials and museums now exist at these locations to honor the victims and educate the public about the events
