U.S. Secret Service agents stand guard outside the Nelson Mandela Centre of Memory as U.S. President Barack Obama visits the family of the former South African president and anti-apartheid hero Nelson... more 
U.S. Secret Service agents stand guard outside the Nelson Mandela Centre of Memory as U.S. President Barack Obama visits the family of the former South African president and anti-apartheid hero Nelson Mandela on Saturday, June 29, 2013, in Johannesburg, South Africa. (AP Photo/Evan Vucci) less 
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Associated Press | Photo By Evan Vucci
Sat, Jun 29, 2013 1:27 PM EDT