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This undated rendering provided by bioLinia and Paul Murdoch Architects depicts the Tower of Voices, which is scheduled to open in September at the Flight 93 National Memorial in Stoystown, Pennsylvania. The 93-foot tower will be part of the commemoration of the downing of the jet on Sept. 11, 2001. It will feature 40 chimes, a symbolic representation of the 40 passengers and crew who perished in the crash of Flight 93.
- bioLinia and Paul Murdoch Architects/Friends of Flight 93 National Memorial via AP