In August 1963, Dr. Martin Luther King Jr. and his aides stayed at The Willard Hotel in the days leading up to the March on Washington for Jobs and Freedom. King prepared the powerful and historic 'I Have a Dream' speech at the hotel. He delivered his iconic address at the Lincoln Memorial. The hotel served as a place of rest, bearing witness to the final preparations for a speech that would forever change the course of history.
Source: National Park Service, Willard Hotel historic-place history; Martin Luther King, Jr. Research and Education Institute, Stanford University, historical resources on the March on Washington for Jobs and Freedom and the August 28, 1963 address