Oscar Pistorius, the South African runner, was formally charged with the Valentine's Day murder of his girlfriend, Reeva Steenkamp.
Russians, Chinese, Brazilians, and others are traveling abroad as never before as the world's growing middle classes get itchy feet.
South Africa is hoping to avoid further isolating Zimbabwe and repeating the refugee crisis that followed the country's 2008 election.
The African National Congress has ruled South Africa since the end of apartheid. But riddled by corruption charges and internal feuding, it looks increasingly vulnerable.
With Obama in South Africa, Mandela's family has said a private visit between the two men might be meaningful for the South African leader.