The curator of the slave house on Gorée Island, just off Dakar at Africa's westernmost tip, is well used to famous visitors. "The Pope, Nelson Mandela, Bill Clinton," says Joseph Ndiaye, 79, reeling off the names in his office, bedecked with paraphernalia from the days when the island served as a prison for hundreds of slaves awaiting transportation to the New World. Since serving as a parachutist with the Senegalese army during the Second World War, Mr Ndiaye has made the slave house his life's work, a site of pilgrimage, he calls it, for European, American and African visitors. Tomorrow...