[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/US/07/17/obama.slavery/art.obama.door.no.return.cnn.jpg caption="Obama points to the Door of No Return, which would shut before Africans were put on slave ships."]
President Obama slowly walked across the grounds of Cape Coast Castle, a slave outpost in Ghana where hundreds of thousands of Africans were shipped as human cargo to a life of bondage in the United States, South America and the Caribbean.
"You almost feel as if the walls can speak. You try to project yourself into these incredibly harrowing moments," Obama told CNN's Anderson Cooper.
When the president reached the "Door of No Return," an arched gateway with thick doors that would shut behind African men, women and children before they were forced onto slave ships, Obama looked out over the Atlantic Ocean where waves crashed onto rocks. "Obviously there's a sense of what a profound sorrow must've been felt as people were hauled off into the great unknown," he said.
What does he tell his two daughters, Sasha and Malia, about slavery?
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