Today marks the 50th anniversary of Dr. Martin Luther King Jr's 'I Have A Dream' speech.

PICS: Remembering Dr. Martin Luther King Jr.

At 3pm in more than 300 sites across the country bells from churches, schools and historical monuments will ring to commemorate the speech.

President Obama, Bill Clinton, Jimmy Carter, Oprah Winfrey, and Jamie Foxx are among a list of speakers who will speak in Washington DC.

International commemorations will also be held in London, Japan, Switzerland, Nepal and Liberia.

“When we allow freedom to ring — when we let it ring from every city and every hamlet, from every state and every city, we will be able to speed up that day when all of God’s children, black men and white men, Jews and Gentiles, Protestants and Catholics, will be able to join hands and sing in the words of the old Negro spiritual, ‘Free at last, free at last, great God almighty, we are free at last,” King said in closing his speech.

Read the entire speech here.

Read more via the Washington Post