Twenty-two years ago today the United States came under attack on its own soil by terrorists who hijacked four commercial jets.
They flew two of them into the World Trade Towers in New York, one into the Pentagon in Arlington, Virginia, and, during a battle with passengers, crashed the fourth one into a field in Pennsylvania.
Here, far away in Prescott Valley, Arizona, those tragic events are memorialized every year.
The Healing Field, as it is called, is a display of some 3,000 flags set up on the grounds of the Prescott Valley Civic Center to honor those whose lives were lost on September 11th, 2001.
Each flagpole carries a card with details about one of the victims.
And boots are placed at the base of the flags of firefighters, police and military victims.
It is a quiet place for people to think back and remember that dark day in America's history.