The Memorial commemorates the victims of the attacks of September 11, 2001, at the World Trade Center, Shanksville, Pennsylvania, and the Pentagon as well as the World Trade Center attack of February 26, 1993. Two fountain-lined voids, centered on the locations of the destroyed twin towers, and a surrounding forest of oak trees form the core of the rebuilt World Trade Center. PWP joined Michael Arad in the final stage of the Memorial design competition with a mandate from the jury to humanize the scheme without diminishing the abstraction that had established it as a finalist. Despite its apparent simplicity, the Memorial is a massive green roof that operates on top of multiple structures.  

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