A man leaps to his death from a fire and smoke filled North Tower of the World Trade Center, on September 11, 2001 in New York City after terrorists crashed two hijacked passenger planes into the twin towers. (Jose Jimenez/Primera Hora/Getty Images

A man leaps to his death from a fire and smoke filled North Tower of the World Trade Center, on September 11, 2001 in New York City after terrorists crashed two hijacked passenger planes into the twin towers. (Jose Jimenez/Primera Hora/Getty Images