AP PHOTOS: The March on Washington

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Associated Press
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Rev. Shanan Jones delivers the "Call to Action" sermon at Ebenezer Baptist during a bell ringing ceremony at Ebenezer Baptist Church in commemoration of when Martin Luther King Jr. delivered his "I Have a Dream" speech fifty years ago, Wednesday, Aug. 28, 2013, in Atlanta. The speech was a rousing call to arms that bolstered the growing civil rights movement, and many argue it helped lead to major legislation passed by Congress a few years later. (AP Photo/Atlanta Journal-Constitution, Curtis Compton)

In a moment rich with history and symbolism, tens of thousands of Americans of all backgrounds and colors thronged to the National Mall Wednesday to join the nation's first black president and civil rights pioneers in marking the 50th anniversary of King's "I Have a Dream" speech.

At the National Cathedral in Washington, the central bell tower played "Lift Every Voice and Sing" from the carillon, along with other hymns and spirituals. The bells rang for about 15 minutes to mark the moment when the speech was delivered.

Here are some of the best photos from today.