Forty voices. Forty lives. A story of courage that will never be forgotten. Standing 93 feet tall at Flight 93 National Memorial, the Tower of Voices holds 40 wind chimes, each representing one of the passengers and crew members of United Airlines Flight 93. When the wind moves across the Pennsylvania landscape, their voices continue to ring. We remember their courage. We remember their sacrifice. We remember the 40 lives lost 25 years ago.