Slave tunnel

President Obama and daughter Sasha walk through the "Door of No Return" during a tour of Cape Coast Castle, a former slavery outpost in Ghana. At any given three-month period, the castle held 1,000 men and 300 women. The men were confined in groups of 200 per chamber roughly the size of a 30-by-15-foot holding cell before they were shipped to America, the Caribbean and elsewhere.
Saul Loeb / AFP/Getty Images
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