In a field amid the rolling hills of central Pennsylvania stands the "Tower of Voices." Ninety-three-feet tall, it honors the heroes of Flight 93.
It will be dedicated later today, the last piece of this 2,200-acre memorial that includes the crash site, known as the sacred ground; a visitor center that tells the story of Flight 93; and the wall of names built directly under the flight path.
The tower, still a work in progress, holds eight wind chimes, but soon there will be 40 – one for each passenger and crew member who died here on September 11, 2001.