A police officer yells for people to run away as the south tower of the World Trade Center collapses on September 11, 2001.

A police officer yells for people to run away as the south tower of the World Trade Center collapses on September 11, 2001.

A man cries while talking to a family member on his cell phone. He feared that he had lost his young daughter who was in daycare in the south tower of the World Trade Center.

A man cries while talking to a family member on his cell phone. He feared that he had lost his young daughter who was in daycare in the south tower of the World Trade Center.

A man cries while talking to a family member on his cell phone. A stranger to him, the woman, left, tried to comfort him with water and by rubbing his neck.

A man cries while talking to a family member on his cell phone. A stranger to him, the woman, left, tried to comfort him with water and by rubbing his neck.

As many walked north away from the towers, others congregated around a car broadcasting the news in the SoHo neighborhood. A woman stares at where the towers once stood.

As many walked north away from the towers, others congregated around a car broadcasting the news in the SoHo neighborhood. A woman stares at where the towers once stood.

A man walks north away from the burning remains of the World Trade Center towers on September 11th.

A man walks north away from the burning remains of the World Trade Center towers on September 11th.

John Sanders, a visitor from Texas, pauses to reflect on the collapse of the twin towers on September 12, 2001. Sanders had attempted to volunteer with rescue and recovery efforts. But like many who congregated at the Jacob Javits Convention Center

John Sanders, a visitor from Texas, pauses to reflect on the collapse of the twin towers on September 12, 2001. Sanders had attempted to volunteer with rescue and recovery efforts. But like many who congregated at the Jacob Javits Convention Center for days after the attack, he was turned away because he had no medical specialty or rescue training.

New Yorkers wait in line to give blood at Lenox Hill hospital the day after the World Trade Center collapsed. While many were eager to help, there were few survivors found among the ruins, so the blood donations were not necessary for the recovery e

New Yorkers wait in line to give blood at Lenox Hill hospital the day after the World Trade Center collapsed. While many were eager to help, there were few survivors found among the ruins, so the blood donations were not necessary for the recovery effort.

Posters of missing people were found all over New York City after the September 11th attacks, like these lining a fence in Union Square. Most were not found, but the images of them became part of the memorial for the victims.

Posters of missing people were found all over New York City after the September 11th attacks, like these lining a fence in Union Square. Most were not found, but the images of them became part of the memorial for the victims.

A crowd gathered to see George W. Bush’s motorcade drive through the streets around Times Square on September 14, 2001.

A crowd gathered to see George W. Bush’s motorcade drive through the streets around Times Square on September 14, 2001.

A Chicago: The Musical poster at a bus kiosk is covered with patriotic computer printouts in Times Square on September 13, 2001.

A Chicago: The Musical poster at a bus kiosk is covered with patriotic computer printouts in Times Square on September 13, 2001.

In Times Square construction workers hang American flags from scaffolding just before a rain on September 13, 2001.

In Times Square construction workers hang American flags from scaffolding just before a rain on September 13, 2001.

An artist draws what remains of the twin towers at what quickly became known as Ground Zero.

An artist draws what remains of the twin towers at what quickly became known as Ground Zero.

Security was strict at John F. Kennedy International airport on November 9, 2001. The soldier wanted to prevent photographs being made of the security checkpoint. Some people were generally skittish about security and photography after the attacks.

Security was strict at John F. Kennedy International airport on November 9, 2001. The soldier wanted to prevent photographs being made of the security checkpoint. Some people were generally skittish about security and photography after the attacks.

A police officer yells for people to run away as the south tower of the World Trade Center collapses on September 11, 2001.
A man cries while talking to a family member on his cell phone. He feared that he had lost his young daughter who was in daycare in the south tower of the World Trade Center.
A man cries while talking to a family member on his cell phone. A stranger to him, the woman, left, tried to comfort him with water and by rubbing his neck.
As many walked north away from the towers, others congregated around a car broadcasting the news in the SoHo neighborhood. A woman stares at where the towers once stood.
A man walks north away from the burning remains of the World Trade Center towers on September 11th.
John Sanders, a visitor from Texas, pauses to reflect on the collapse of the twin towers on September 12, 2001. Sanders had attempted to volunteer with rescue and recovery efforts. But like many who congregated at the Jacob Javits Convention Center
New Yorkers wait in line to give blood at Lenox Hill hospital the day after the World Trade Center collapsed. While many were eager to help, there were few survivors found among the ruins, so the blood donations were not necessary for the recovery e
Posters of missing people were found all over New York City after the September 11th attacks, like these lining a fence in Union Square. Most were not found, but the images of them became part of the memorial for the victims.
A crowd gathered to see George W. Bush’s motorcade drive through the streets around Times Square on September 14, 2001.
A Chicago: The Musical poster at a bus kiosk is covered with patriotic computer printouts in Times Square on September 13, 2001.
In Times Square construction workers hang American flags from scaffolding just before a rain on September 13, 2001.
An artist draws what remains of the twin towers at what quickly became known as Ground Zero.
Security was strict at John F. Kennedy International airport on November 9, 2001. The soldier wanted to prevent photographs being made of the security checkpoint. Some people were generally skittish about security and photography after the attacks.

A police officer yells for people to run away as the south tower of the World Trade Center collapses on September 11, 2001.

A man cries while talking to a family member on his cell phone. He feared that he had lost his young daughter who was in daycare in the south tower of the World Trade Center.

A man cries while talking to a family member on his cell phone. A stranger to him, the woman, left, tried to comfort him with water and by rubbing his neck.

As many walked north away from the towers, others congregated around a car broadcasting the news in the SoHo neighborhood. A woman stares at where the towers once stood.

A man walks north away from the burning remains of the World Trade Center towers on September 11th.

John Sanders, a visitor from Texas, pauses to reflect on the collapse of the twin towers on September 12, 2001. Sanders had attempted to volunteer with rescue and recovery efforts. But like many who congregated at the Jacob Javits Convention Center for days after the attack, he was turned away because he had no medical specialty or rescue training.

New Yorkers wait in line to give blood at Lenox Hill hospital the day after the World Trade Center collapsed. While many were eager to help, there were few survivors found among the ruins, so the blood donations were not necessary for the recovery effort.

Posters of missing people were found all over New York City after the September 11th attacks, like these lining a fence in Union Square. Most were not found, but the images of them became part of the memorial for the victims.

A crowd gathered to see George W. Bush’s motorcade drive through the streets around Times Square on September 14, 2001.

A Chicago: The Musical poster at a bus kiosk is covered with patriotic computer printouts in Times Square on September 13, 2001.

In Times Square construction workers hang American flags from scaffolding just before a rain on September 13, 2001.

An artist draws what remains of the twin towers at what quickly became known as Ground Zero.

Security was strict at John F. Kennedy International airport on November 9, 2001. The soldier wanted to prevent photographs being made of the security checkpoint. Some people were generally skittish about security and photography after the attacks.

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