9/11 memorial and museum

Updated 11:18 AM ET, Thu May 15, 2014
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Artifacts from ground zero get a preview at the National September 11 Memorial & Museum in New York. Among them is a cross made out of steel from the World Trade Center in the 2001 attacks. The museum opened in 2014. Spencer Platt/Getty Images
A destroyed New York City Fire Department ambulance from ground zero is on display. Spencer Platt/Getty Images
Cards, patches and mementos of those killed at ground zero -- single objects convey the tragedy of that day, the deadliest terrorist attack on American soil. Spencer Platt/Getty Images
An American flag was recovered from the World Trade Center site. Spencer Platt/Getty Images
Pieces of American Airlines Flight 11 are on display. The plane plowed into the North Tower of the World Trade Center at 8:46 a.m. on September 11, 2001. STAN HONDA/AFP/Getty Images
The remains of a New York City Fire Department Ladder Company 3 truck are on display outside the historical exhibition area. Eleven members of Ladder 3 died when the North Tower crumbled. STAN HONDA/AFP/Getty Images
Helmets worn by firefighters on September 11, including those of Christian Waugh, were donated by families. STAN HONDA/AFP/Getty Images
A photograph at the memorial shows one of the World Trade Center towers collapsing after the attack. STAN HONDA/AFP/Getty Images
The symbolic "Last Column," right, a steel beam from one of the towers, stands near the "slurry wall," left, which holds back the Hudson River waters. STAN HONDA/AFP/Getty Images
A firefighter shirt from ground zero is on view. Spencer Platt/Getty Images
The wedge-shaped pavilion entrance of the museum, center, is located between the square outlines of the memorial waterfalls at the World Trade Center. Mark Lennihan/AP
A visitor to the National September 11 Memorial & Museum takes in the sight. Mary Altaffer
A rose is placed next to the name of a victim of the terrorist attacks on the World Trade Center at the North Pool of the memorial. Mary Altaffer/AP
Part of the World Trade Center's original foundation, left, and the last column removed from the WTC site, center, are covered in a protective wrap during construction of the museum. Mary Altaffe/AP
The "Cross," made of intersecting steel beams found in the rubble of 6 World Trade Center, and a fragment of a trident column, center, one of 84 that formed the exterior structure of each tower, are prepared for display. Mary Altaffer/AP
The original stairway from the World Trade Center Plaza to Vesey Street, left, is seen at the museum. Mary Altaffer
Contractors work to finish construction of the memorial and museum. Mary Altaffer
One World Trade Center rises above the lower Manhattan skyline in New York. Mark Lennihan/AP