President Obama closed his trip to Ghana by saying it had been a particularly meaningful trip for him.

At a ceremony at the Accra, Ghana, airport, Obama said he would never forget the image of his two daughters walking through the "doors of no return" at the Cape Coast Castle, a prison thousands of Africans passed through on their way to slavery.

When his daughters did walk through those doors, he said it was a reminder that "while the future is unknown, the winds always blow in the direction of human progress."

Obama boarded a plane after he and Ghana's president both made remarks to a crowd. Obama offered special thanks to a group of Peace Corps volunteers who cheered loudly when he thanked them for attending the event. Ghana was the first country to accept Peace Corps volunteers, Obama said.

- Ian Swanson