On August 28, 1963, an estimated 250,000 participants took part in the March on Washington for Jobs and Freedom. After the march, Dr. Martin Luther King Jr. stood in front of the Lincoln Memorial where he delivered his iconic "I Have a Dream" speech calling for an end to racial discrimination. It was a watershed moment for civil rights in America. USA TODAY spoke with witnesses of that historic day who vividly recall what it was like to be there.