Tokens honoring Flight 93 sit near the fence surrounding the permanent memorial's construction site in May 2011.
Workers build the memorial plaza's wall.
Workers prepare the plaza for paving.
Pavers are installed on the memorial's flight path walkway.
The memorial's entrance is seen here in July 2011.
This scene is of the sidewalk approaching the memorial plaza.
The memorial's field of honor is seen in bloom.
This entrance is the ceremonial gateway to the crash site.