It's the first September 11 commemoration that New York City has held at its completed, 16-acre memorial site.
Amid the disorder left on the city by its most recent terror threat -- and the ensuing police response of closed roads, check points, and bag searches -- hundreds of thousands turned to peace and reflection in the ceremonies at the site of the World Trade Center attacks.
Over the years, poems and songs have helped the U.S. grieve, heal and move past the most difficult of times. At Sunday's ceremony, and in past memorial services for September 11, these pieces of deeply meaningful prose took center stage.
Former New York City Mayor Rudy Giuliani and his wife Judith Nathan pay their respects at the WTC reflection pool, Sunday, Sept. 11, 2011 in New York. (AP Photo/Mary Altaffer)
Rudy Giuliani, who was in the final months of mayoralty in New York City when the twin towers were struck, read an excerpt from the King James version of the Bible -- Ecclesiastes 3:1 -- also popularized in a song adapted by Pete Seeger in 1962, called "Turn, Turn Turn,":
To every thing there is a season,
and a time to every purpose under the heaven
A time to be born, and a