The pavilion entrance to the National September 11 Memorial Museum, center, is next to one of the memorial reflecting pools, lower right, Thursday, May 15, 2014 in New York. President Barack Obama is to attend the dedication of the underground museum Thursday before it opens to the general public May 21. (AP Photo/Mark Lennihan)
Architect Daniel Libeskind attends the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. President Barack Obama and Sept. 11 survivors, rescuers and victims’ relatives are expected to mark the opening of the 9/11 museum, where the story of the terrorist attacks is told on a scale as big as the twin towers’ columns and as intimate as victims’ last voicemails. (AP Photo/Richard Drew, Pool)
President Barack Obama and former New York City Mayor Michael Bloomberg tour the destroyed Ladder 3 truck at the September 11 Memorial Museum, Thursday, May 15, 2014, in New York. Speaking at the dedication, the president said, no act of terror can match the strength and character of the United States. He says, quote, "Nothing can ever break us." (AP Photo/Carolyn Kaster)
President Barack Obama and former Secretary of State Hillary Rodham Clinton tour Memorial Hall at the National September 11 Memorial Museum with former New York City Mayor Michael Bloomberg, Thursday, May 15, 2014, in New York. Speaking at the dedication, the president said, no act of terror can match the strength and character of the United States. (AP Photo/Carolyn Kaster)
FILE - This Sept. 10, 2012 file photo shows electronic images of victims of the attacks of Sept. 11, 2001, destined to be a part of the future 9/11 Memorial Museum, during a news conference in New York. The museum will be dedicated in a ceremony attended by President Barack Obama on Thursday, May 15, 2014. It will open to the public May 21. (AP Photo/Mark Lennihan, File)
Portraits of the Al-Qaeda hijackers are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)
A portion of the World Trade Center slurry wall, left, and the symbolic last beam, are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)
In this May 5, 2014 photo released by the National September 11 Memorial Museum, a piece of airplane damaged in the attacks of September 11, 2001, is displayed at the New York museum. The long-delayed museum will be dedicated during a ceremony Thursday, May 15, 2014. (AP Photo/National September 11 Memorial Museum, Jin Lee)
The only existing model of the World Trade Center is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)
Steel from the World Trader Center north tower floors 97 and 98, left, is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)
In this May 5, 2014 photo released by the National September 11 Memorial Museum, a firetruck, damaged in the attacks of September 11, 2001, is on display at the New York museum. The long-delayed museum will be dedicated during a ceremony Thursday, May 15, 2014. (AP Photo/ National September 11 Memorial Museum, Jin Lee)
Workers walk by the World Trade Center south tower excavation display at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)
A section of steel facade, from floors 96-99 of the north tower of the World Trade Center, is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)
A pair of World Trade Center tridents, that once formed part of the exterior structural support of the east facade of the building, are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)
A salvaged bicycle rack, that was located on the northern edge of the World Trade Center site, is displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)
The remains of New York City Fire Dept. truck from Engine Company 21 are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)
The Family Viewing Platform, and memorabilia from the World Trade Center, are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)
Members of the media tour the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)
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