The Obamas tour slave dungeons

Watch President Obama speak of his family's experience touring the slave dungeons of Cape Coast Castle.

(AP Photo/Haraz N. Ghanbari)

CAPE COAST, Ghana (AP) -- President Barack Obama says a slave site he visited today in Ghana reminds him of humanity's potential for "great evil." But he says it also gives him a reason for hope, given the progress African-Americans have made since leaving the castle as slaves.

Obama toured a seaside fortress that the British used as slave dungeons during the 17th century. Obama said the site reminded him of a recent trip to a Nazi concentration camp in Germany.

Obama visited the Cape Coast site with his wife, Michelle and their daughters. Obama says it's important for his girls to learn an obligation to fight oppression and learn about history's cruelty.

He says that no matter how vicious that history might be, it is possible to overcome it.

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