The September 11, 2001 (9/11) terrorist attacks occurred at three main locations in the United States:

• Two hijacked planes were flown into the Twin Towers of the World Trade Center in New York City, causing both towers to collapse

• A third plane crashed into the Pentagon, the U.S. military headquarters, located just outside Washington, D.C.

• The fourth hijacked plane crashed into a field near Shanksville, Pennsylvania, after passengers attempted to regain control, preventing it from hitting another target such as the U.S. Capitol or White House

Nearly 3,000 people lost their lives across these three sites on that day

. The World Trade Center site in New York City is now home to the National September 11 Memorial & Museum

. The Flight 93 National Memorial in Pennsylvania commemorates the passengers and crew who thwarted the attack on the fourth plane

. These locations mark the key sites where the 9/11 attacks took place.