The 9/11 Memorial opens this Sunday to the public, on the tenth anniversary of the attacks. We take a look at the landscape architecture, designed by Peter Walker, in conjunction with the project's architect, Michael Arad.
The plaza's many trees also serve as a green roof for the Memorial Museum and the subway station that 70 feet below. In order to provide adequate support for the trees, a suspended paving system was created, with pavement layered on top of troughs filled with soil. Each of troughs—18-foot-wide bands of soil—are adjacent to tunnels that allow workers to reach pipes and utility lines.