The Tower of Voices is a monumental 93-foot-tall musical instrument located at the entrance of the Flight 93 National Memorial in Pennsylvania. It serves as a "living memorial" containing 40 uniquely pitched wind chimes, each representing one of the 40 passengers and crew members who lost their lives on September 11, 2001. The tower's height (93 feet) is a direct tribute to the flight number. The chimes are activated by the wind, creating a constant, hauntingly beautiful harmony that changes with the weather, symbolizing that the voices of the heroes continue to be heard. It is the only chime structure of its kind in the world, designed using music theory to ensure the sounds are both distinct and concordant. For visitors in 2026, the tower stands as a powerful auditory landmark that provides a space for reflection before they enter the more somber memorial groves.