Families, survivors, first responders and dignitaries marked the 25th anniversary of the 9/11 attacks with somber and poignant ceremonies. That included major gatherings in New York, at the Pentagon and in Shanksville, Pennsylvania. The attacks killed 2,977 people and set the country on a course that would define the next quarter-century. Geoff Bennett reports.

As the 25th anniversary of the September 11 attacks approaches, we want to hear from readers about where you were and what you remember of that historic moment in 2001

The 2001 attacks unfolded across New York, Virginia, and Pennsylvania, killing nearly 3,000 people and permanently changing American life.