Artifacts from the 9/11 Memorial and Museum

Personal items belonging to Marisa Dinardo donated to the National September 11 Memorial & Museum in New York. Ira Block / National September 11 Memorial & Museum

Tools belonging to Durrell Pearsall of NYFD Rescue 4 discovered in the debris. Ira Block / National September 11 Memorial & Museum

Artifacts from the 9/11 Memorial and Museum

Some of the rescue vehicles that were destroyed at the World Trade Center on Sept. 11, 2001, are currently housed in Hangar 17 at JFK Airport. Ira Block / National September 11 Memorial & Museum

Artifacts from the 9/11 Memorial and Museum

Artifacts from the World Trade Center site that were destroyed on Sept. 11, 2001, are seen in Hangar 17 at JFK Airport in Queens. Jennifer S. Altman / For The Washington Post

Artifacts from the 9/11 Memorial and Museum

A steel cross stands among the twisted beams in the debris field of what once was 5 World Trade Center as cleanup and recovery efforts continued. Louis Lanzano / AP

Artifacts from the 9/11 Memorial and Museum

Shoes belonging to Police Officer John Stiastny. Ira Block / National September 11 Memorial & Museum

Artifacts from the 9/11 Memorial and Museum

Nancy J. Johnson, manager of the World Trade Center Artifacts Program, is seen with artifacts from the World Trade Center site that were destroyed on Sept. 11, 2001, and currently reside in Hangar 17 at JFK Airport. Jennifer S. Altman / For The Washington Post

Artifacts from the 9/11 Memorial and Museum

A golf ball found among the debris of the fallen World Trade Center towers. Ira Block / National September 11 Memorial & Museum

Artifacts from the 9/11 Memorial and Museum

Shoes worn by Michelle Martocci on Sept. 11, 2001. She survived the attack on the World Trade Center. Ira Block / National September 11 Memorial & Museum

Artifacts from the 9/11 Memorial and Museum

Artifacts from the World Trade Center site are seen in Hangar 17 at JFK Airport. Jennifer S. Altman / For The Washington Post

Artifacts from the 9/11 Memorial and Museum

A floor sign from the 78th floor of one of the towers. Ira Block / National September 11 Memorial & Museum

Artifacts from the 9/11 Memorial and Museum

A fire helmet that was broken into pieces from Fire Department Squad 18 discovered in the debris after the terrorist attacks of Sept. 11, 2001. Ira Block / National September 11 Memorial & Museum

Artifacts from the 9/11 Memorial and Museum

In Hangar 17 at JFK Airport, part of the remains of the Alexander Calder sculpture, titled WTC Stabile, that was in front of the World Trade Center when the planes hit on Sept. 11, 2001. Ira Block

Artifacts from the 9/11 Memorial and Museum

Some of the trident beams recovered after the Sept. 11, 2001, attacks on the World Trade Center are currently housed at Hangar 17 at JFK Airport. Ira Block / National September 11 Memorial & Museum

Artifacts from the 9/11 Memorial and Museum

Artifacts from the World Trade Center site that were destroyed on Sept. 11, 2001, are seen in Hangar 17 at JFK Airport. Jennifer S. Altman / For The Washington Post

Artifacts from the 9/11 Memorial and Museum

Workers at the World Trade Center disaster site look up at a large illuminated cross near the rubble of the collapsed buildings at Ground Zero. Ed Betz / AP

Artifacts from the 9/11 Memorial and Museum

The National September 11 Memorial & Museum in New York contains items found at Ground Zero, from victims; shoes to firefighters; gear. Looking west from Building 4 at Memorial Pool, the footprint of the fallen Tower 2. The white building to the right is the new memorial museum. The tall building under construction is the Freedom Tower One WTC. Ira Block / National September 11 Memorial & Museum

Artifacts from the 9/11 Memorial and Museum

Artifacts from the 9/11 Memorial and Museum

Personal items belonging to Marisa Dinardo donated to the National September 11 Memorial & Museum in New York. Ira Block / National September 11 Memorial & Museum

Tools belonging to Durrell Pearsall of NYFD Rescue 4 discovered in the debris. Ira Block / National September 11 Memorial & Museum

Some of the rescue vehicles that were destroyed at the World Trade Center on Sept. 11, 2001, are currently housed in Hangar 17 at JFK Airport. Ira Block / National September 11 Memorial & Museum

Artifacts from the World Trade Center site that were destroyed on Sept. 11, 2001, are seen in Hangar 17 at JFK Airport in Queens. Jennifer S. Altman / For The Washington Post

A steel cross stands among the twisted beams in the debris field of what once was 5 World Trade Center as cleanup and recovery efforts continued. Louis Lanzano / AP

Shoes belonging to Police Officer John Stiastny. Ira Block / National September 11 Memorial & Museum

Nancy J. Johnson, manager of the World Trade Center Artifacts Program, is seen with artifacts from the World Trade Center site that were destroyed on Sept. 11, 2001, and currently reside in Hangar 17 at JFK Airport. Jennifer S. Altman / For The Washington Post

A golf ball found among the debris of the fallen World Trade Center towers. Ira Block / National September 11 Memorial & Museum

Shoes worn by Michelle Martocci on Sept. 11, 2001. She survived the attack on the World Trade Center. Ira Block / National September 11 Memorial & Museum

Artifacts from the World Trade Center site are seen in Hangar 17 at JFK Airport. Jennifer S. Altman / For The Washington Post

A floor sign from the 78th floor of one of the towers. Ira Block / National September 11 Memorial & Museum

A fire helmet that was broken into pieces from Fire Department Squad 18 discovered in the debris after the terrorist attacks of Sept. 11, 2001. Ira Block / National September 11 Memorial & Museum

In Hangar 17 at JFK Airport, part of the remains of the Alexander Calder sculpture, titled WTC Stabile, that was in front of the World Trade Center when the planes hit on Sept. 11, 2001. Ira Block

Some of the trident beams recovered after the Sept. 11, 2001, attacks on the World Trade Center are currently housed at Hangar 17 at JFK Airport. Ira Block / National September 11 Memorial & Museum

Artifacts from the World Trade Center site that were destroyed on Sept. 11, 2001, are seen in Hangar 17 at JFK Airport. Jennifer S. Altman / For The Washington Post

Workers at the World Trade Center disaster site look up at a large illuminated cross near the rubble of the collapsed buildings at Ground Zero. Ed Betz / AP

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