Postal Service facilities across the nation were closed Jan. 16 in observance of Martin Luther King Jr. Day.
The annual holiday “celebrates the life and legacy of a man who brought hope and healing to America,” according to the site for the King Center. King’s widow, Coretta Scott King, established the center in 1968 to educate people on his life.
King was a Baptist minister and leader in the civil rights movement. He helped organize the 1963 March on Washington, where he delivered his famous “I Have a Dream” speech.
King received the Nobel Peace Prize in 1964, four years before his assassination.
USPS has released several stamps throughout the years to honor King and his work, including a 1999 stamp that featured King and a 2013 stamp that commemorated the March on Washington’s 50th anniversary.
The King Center’s site has more information about King’s life.