After the traumatic event of Sept. 11, 2001, a national memorial was built to honor the 184 lives lost in the attack. The memorial, which is located just outside the Pentagon, was dedicated 2008, seven years to the day after the attack. The memorial sits on two acres of land with dozens of Crape Myrtle trees surrounding the serene landscape. There are 184 memorial benches dedicated to each of the victims arranged along an age line, according to the year they were born. Each bench contains a pool of water that reflects light in the evening, and they are all positioned to differentiate those who were on board American Flight 77 from those who were in the Pentagon. The benches honoring victims onboard the plane face the direction of the plane approaching the Pentagon, while those dedicated to the victims inside the Pentagon are positioned to face the plane's point of impact on the Pentagon's south facade. The memorial site also has a curved wall, dubbed the Age Wall, which grows one inch in height to represent the ages of the victims. There is also a memorial chapel which was built within a year of the attack, for all faiths to pray and worship. In front of the chapel, there's a memorial window which was designed to look like the Survivor's Pin and was given to each survivor of the attack. The memorial is free and open to the public 24 hours a day, every day. There's limited parking so its best to take the Metrorail to the Pentagon or Pentagon City stop on the Blue and Yellow lines and then walk from there.