Photos at the Flight 93 National Memorial in Shanksville, Pa.
Twenty years ago United Airlines Flight 93 crashed into a former coal field near after a struggle in the cockpit between the passengers and al-Qaeda hijackers. The Flight 93 National Memorial near Shanksville, Pa. is the final resting place of the 40 passengers and crew - sacred ground and a monument to the sacrifice they made.

Joey Cappelletti, Associated Press
Nicole Winfield, Associated Press
Beth Reinhard, New York Times
Michael R. Sisak, Associated Press
Will Weissert, Associated Press
Linley Sanders, Humera Lodhi and Amelia Thomson-Deveaux, Associated Press
Andrew Ackerman, Bloomberg
Mike Livingston

























