Obama, family visit cell that became Mandela’s crucible President cites legacy of sacrifice in later speech ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page Carolyn Kaster/AP President Obama visited the prison cell on Robben Island where former South African president Nelson Mandela was jailed. SAUL LOEB/AFP/Getty Images At a speech in Cape Town, he challenged young Africans to shore up progress on the continent that rests on a "fragile foundation." SAUL LOEB/AFP/Getty Images Obama visited a classroom at the Desmond Tutu HIV Foundation Youth Centre. SAUL LOEB/ AFP/Getty The Obama family toured a limestone quarry where prisoners worked. SAUL LOEB/AFP/Getty The president said he was "deeply humbled" by a visit to the prison where Mandela spent 18 of his 27-year prison term.