ສ​ຫລ ລະ​ນຶກ​ເຖິງ Dr. Martin Luther King, Jr.

A painting, created by French artist Saype and said to be the world's largest biodegradable painting, is seen on the Chaux-de-Mont ski slope above the Alp resort of Leysin, Switzerland.

Homeland Security Secretary Jeh Johnson speaks before a wreath laying ceremony at the Martin Luther King, Jr. Memorial, in honor of MLK Day in Washington, Jan. 19, 2015.

Marchers hold up signs as they make their way towards the Edmund Pettus Bridge in honor of Martin Luther King, Jr., in Selma, Alabama, Jan. 18, 2015.

Oprah Winfrey locks arms with David Oyelowo (left) who portrays Martin Luther King, Jr. in the movie "Selma," Ava DuVernay, the director of "Selma" and rapper Common (far left) as they march to the Edmund Pettus Bridge in honor of Martin Luther King Jr., Selma, Alabama, Jan. 19, 2015.

Marchers line up and lock arms before they make their way to the Edmund Pettus Bridge in honor of Martin Luther King Jr., Selma, Alabama, Jan. 18, 2015.

Homeland Security Secretary Jeh Johnson (left) participates in a wreath laying ceremony at the Martin Luther King, Jr. Memorial, on MLK Day, in Washington, Jan. 19, 2015.