9/11's High School Students Watched it All Unfold

This photo was taken from a fourth floor classroom window as the second tower was falling. As tragedy unfolded blocks away the students were first held in the building for safety and then evacuated. (Courtesy Marlenas McMahon-Purk)

Juan Angel Arce was a sophomore at Stuyvesant on 9/11. Here he is pictured with his father in front of the Twin Towers when he was a young boy. (Courtesy Juan Angel Arce)

Juan Angel Arce pictured in 2009. He works for the United Nations Secretariat as a political officer.  (Courtesy Juan Angel Arce)

Students from Ironwood High School in Glendale, Arizona sent messages to Stuyvesant as a gesture of support and unity. (Courtesy Noah Van Gilder)

Students leave Stuyvesant High School at the end of the school day October 9, 2001 in New York City. The students were allowed to return to the school today for the first time since September 11. (Photo by Mario Tama/Getty Images)

Students gather outside Stuyvesant at the end of the school day October 9, 2001 in New York City. (Photo by Mario Tama/Getty Images)

Students and others leave Stuyvesant High School on October 9, 2001 in New York City. (Photo by Mario Tama/Getty Images)

Stuyvesant High School (Photo by Peter Kramer/Getty Images) (2005 Getty Images)

The sun sets over Jersey City and the World Trade Center site, with One World Trade Center to the right on August 28, 2011 in New York City. (Photo by Chip Somodevilla/Getty Images) (2011 Getty Images)