The Pentagon Memorial (documentary)

The Pentagon Memorial, located just southwest of The Pentagon in Arlington County, Virginia, is a permanent outdoor memorial to the 184 people who died as victims in the building and on American Airlines Flight 77 during the September 11 attacks.
Designed by Julie Beckman and Keith Kaseman of the architectural firm of Kaseman Beckman Advanced Strategies with engineers Buro Happold, the memorial opened on September 11, 2008, seven years after the attack.
The National 9/11 Pentagon Memorial is the first national memorial dedicated to the tragic events that occurred on Sept. 11, 2001. All 184 lives lost in the attack on the Pentagon are represented by “Memorial Units.” Each unit has a victim’s age and location at the time of the attack inscribed on it. The units are arranged along an age line, according to the year each victim was born. They are positioned to differentiate those who were on board American Airlines Flight 77 and those who were in the Pentagon, and each contains a pool of water that reflects light in the evenings. Surrounding the units are 85 Crape Myrtles (trees that will grow up to 30 feet tall) and the Age Wall, which grows one inch in height per year relative to the ages of the victims. According to the National Park Service, more than 225,000 people visit the memorial each year.
Credits: DoD News, The Pentagon Memorial Fund.