Americans took time to remember those lost in the Sept. 11, 2001, terrorist attacks in memorials, classrooms, homes and work places across the country Wednesday. Crowds gathered at the site of the former World Trade Center twin towers in New York City at 8:46 a.m. ET for a moment of silence to mark the time that the first plane crashed into the downtown buildings. President Barack Obama marked the moment on the White House lawn, followed by a moment of silence at the Pentagon to remember the time Flight 77 hit the building. Friends and family members read the names of the deceased at the 9/11 Memorial in New York. Workers in Shanksville, Penn., broke ground on the Flight 93 National Memorial on Tuesday to begin construction on a visitor center that will tell the history of Flight 93, the plane that was taken by four hijackers and turned towards Washington, D.C. And Wednesday evening in lower Manhattan, the twin beams of the "Tribute of Light" was set to begin at sunset.