President Barack Obama says slavery is a terrible part of the United States' history and should be taught in a meaningful way.

Obama compared the legacy of slavery to the history of the Holocaust. He said both are horrible parts of history but shouldn't be ignored. He says in a CNN interview that their lessons must never be forgotten.

Obama returned to Washington early Sunday morning from a trip that took him to Russia, Italy and Ghana. It was the first trip to sub-Saharan Africa for America's first black president.

Obama and his family visited a West African castle where traders once shipped slaves to the New World.

Obama was interviewed Saturday for CNN's "Anderson Cooper: 360." A brief excerpt was released on Sunday.

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