A symbol of the bravery and sacrifice shown by the people killed when Flight 93 was hijacked on Sept. 11, 2001, is being dedicated in western Pennsylvania.
The Tower of Voices is a 93-foot- (28-meter-) tall concrete structure that features a wind chime for each of the 40 passengers and crew who died when the aircraft crashed into a rural field.
Each chime is tuned and positioned to give it a distinct sound.
The Flight 93 National Memorial north of Shanksville already includes a memorial plaza, dedicated on the 10th anniversary in 2011, and a visitor’s center that opened three years ago.
Nearly 3,000 people died after terrorists seized control of four planes, flying two into the World Trade Center in New York and the fourth into the Pentagon.