Each artifact shows a haunting aspect of the Sept. 11 attacks on the World Trade Center Towers. The "cross" of intersecting steel beams from the rubble that became a symbol for remembering those lost in the attacks. The slurry wall. The last column taken from the site. An original stairway to World Trade Center Plaza. One of the fire trucks damaged in the towers' collapse. All will be displayed when the museum is set to open in the spring.
Here's a gallery of images from an early tour of the museum.
Follow AP photographers and photo editors on Twitter: http://apne.ws/15Oo6jo