Tens of thousands gathered at the Lincoln Memorial Saturday to mark the 40th anniversary of the 1963 March on Washington where the late Rev. Martin Luther King Jr. delivered his “I Dave a Dream” speech.

On Saturday King’s son, Martin Luther King III called on the country to follow in his father’s footsteps and abolish racial profiling, end the death penalty and establish a universal health care system.

On Friday, Coretta Scott King and others placed a plaque to mark the spot on the steps of the Lincoln Memorial where her late husband made his historic speech.