The Pentagon Memorial pays tribute to the men, women and children who were killed on September 11, 2001. It replaces the impromptu memorial that was established on a hill that overlooks the Pentagon near the Navy Annex. Located southwest of the Pentagon, the permanent outdoor marker commemorates the 184 victims who were killed on American Airlines Flight 77 and those inside the building when it was struck by the airplane. The memorial, designed by Keith Kaseman and Julie Beckman, was opened to the public in 2008.
The monument consists of 184 illuminated benches. Each one has an affixed plaque bearing the name of a victim. The benches are arrayed on a green space that is almost two-acres in accordance with the age of the victims from Dana Falkenberg age 3 to John Yamnicky, Sr. age 71. Guests who visit the memorial must face the Pentagon to read the names of those killed inside the building. When reading the name of someone who died onboard the aircraft, visitors must look skyward in the opposite direction, symbolically following the flight path of the plane. The memorial site also includes reflecting pools beneath the benches, a wall that rises from 3 inches to 71 inches and approximately 85 Paperbark maple trees. More than 225,000 people visit the memorial each year.