A placard showing a picture of the late South African president Nelson Mandela is seen on the pavement outside the First National Bank (FNB) Stadium, also known as Soccer City, ahead of Mandela's national memorial service on Tuesday in Johannesburg December 10, 2013. World leaders, from U.S. President Barack Obama to Cuba's Raul Castro, will pay homage to Mandela at the memorial that will recall his gift for bringing enemies together across political and racial divides. [Photo/Agencies]