Presidents Bush, Clinton and Speaker Boehner Come Together in Support of Flight 93 Memorial

The memorial includes polished granite slabs bearing the names of the 40 victims. It also features an elongated walkway next to a circular field -- permanently restricted to family members -- where the jetliner slammed into the ground. When complete, it will cover 2,200 acres, and will include a memorial wall, a grove of 40 trees (one for each passenger or crew member who died), and, eventually, a 93-foot "tower of voices," comprising 40 wind chimes.