Under construction.

Designed by Davis Brody Bond, LLP, the museum will be located approximately 70 feet (21 m) below ground, and will be accessed through an entry pavilion designed by Snøhetta, Norwegian architectural firm. The entry pavilion comprises a deconstructivist design, making it resemble a partially collapsed building which mirrors the attacks of 9/11. Two of the original tridents from the Twin Towers will be located in this pavilion... Source: Wikipedia

You can see one of the tridents on the far right.

The Survivor's Staircase is also within the Memorial. For more information on the staircase click here: http://www.pbase.com/frank_b/image/154053697