
U.S. President Barack Obama visits the cell where Nelson Mandela, an anti-apartheid activist, was once jailed on Robben Island, on June 30, 2013. Paying homage to the 94-year-old former South-African president, who is critically ill in hospital, Obama stared into the stark cell where Mandela spent two thirds of his 27 years in jail. (Jim WatsonAFP/Getty Images)