ROBBEN ISLAND, South Africa – President Obama and his family visited this historic island on Sunday, taking a solemn tour of the cell where Nelson Mandela was jailed for decades.

“We’re deeply humbled to stand where men of such courage faced down injustice and refused to yield,” Obama wrote in a guest book in the jail’s open air, dirt field, surrounded by high walls and barbed wire. First lady Michelle Obama watched him write the message and signed her name with his when he was finished.