Find out why Martin Van Buren is known as the "ok" president, and why he's considered the first professional politician to hold the office.

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Find out why New York Democrat and American President Martin Van Buren was considered the ultimate political machine in American politics.

From 1954 until 1960, Martin Luther King Jr. was the pastor of the Dexter Avenue King Memorial Baptist Church, the only church where MLK pastored and the site where he began his Civil Rights activism.

On the night of January 27, 1956, when he was just 27 years old, Martin Luther King Jr. received a threatening phone call that would cause his life to change forever.

The German monk's questioning of Catholic dogma leads to the Protestant Reformation.

On April 4, 1968, civil rights leader Martin Luther King, Jr. was shot and killed by a sniper while standing outside his hotel room in Memphis. After attending a memorial service the next day, President Lyndon B. Johnson speaks to the nation about the tragedy in a broadcast from the White House.

Notable people, including Jada Pinkett Smith, Deepak Chopra, Carmen de Lavallade, Michael Strahan, Bernice King, and Sunny Hostin, talk about the impact Martin Luther King, Jr. had on their lives and what they see from their own "mountaintops."