At Nelson Mandela's former prison, Barack Obama wrote how "deeply humbled" he was "to stand where men of such courage faced down injustice."
"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."
President Obama wrote his comments in the visitors' book in the prison courtyard where he saw where Mandela worked and hid his draft of his book A Long Walk to Freedom.
More top news
Rail companies could be made to inform delayed passengers of their compensation rights via train announcements.
The British arm of the retail chain earned 7.7 billion in sales in 2015.
The Canadian government has settled thousands of refugees fleeing conflict in Syria.