Reflecting Absence - 911 Memorial, New York
Reflecting Absence, designed by Michael Arad and Peter Walker, was chosen as the winning design on January 6, 2004. It consists of a field of trees interrupted by two large, recessed pools, the footprints of the Twin Towers. The deciduous trees (swamp white oaks) are arranged in rows and form informal clusters, clearings and groves. The park is at street level, above the Memorial Museum. The names of the victims of the attacks (including those from the Pentagon, American Airlines Flight 77, United Airlines Flight 93, and the 1993 World Trade Center bombing) are inscribed on the parapetssurrounding the waterfalls in an arrangement of "meaningful adjacencies". On September 11, 2011, a dedication ceremony commemorating the tenth anniversary of the attacks was held at the memorial. It opened to the public the following day.
Note that the reflection of the buildings forms the number 9-1-1 in the water!