President Obama continued his South Africa tour on Sunday while former South African president Nelson Mandela remained in hospital care in Pretoria.
One day after meeting with Mandela's family members on Saturday at the Nelson Mandela Centre of Memory, the U.S. President and the first family, accompanied by South African President Jacob Zuma, flew by helicopter to the Robben Island prison off Cape Town's coast, where South Africa's apartheid government held Mandela for 27 years.
They were guided by former inmate and anti-apartheid activist Ahmed Kathrada, 83, who spoke about his time in the prison with Mandela and other African National Congress prisoners.
Obama previously visited Mandela's cell in 2006 during an Africa tour while he was a U.S. senator.
"On behalf of our family we're deeply humbled to stand where men of such courage faced down injustice and refused to yield," Obama wrote in the landmark's guestbook. "The world is grateful for the heroes of Robben Island, who remind us that no shackles or cells can match the strength of the human spirit."