On this Presidents" Day, we"re stepping back in time and behind the scenes at the Lincoln Memorial in Washington, DC. In this photograph, taken August 28, 2013, the giant marble statue of President Abraham Lincoln seems to be looking on approvingly as then-President Barack Obama, first lady Michelle Obama, and former Presidents Bill Clinton and Jimmy Carter walk to the stage for a celebration marking the 50th anniversary of the historic 1963 March on Washington for Jobs and Freedom. It was during that march, of course, when civil rights leader Martin Luther King Jr. delivered his famous "I Have a Dream" speech from the steps of this memorial.