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The World Converges on South Africa - The memorial service for former South African President Nelson Mandela on Tuesday is poised to be one of the largest such gatherings in generations with tens of thousands of local mourners and dozens of foreign leaders expected. — By Associated Press(Photo: Sean Gallup/Getty Images)

Photo By Photo: Sean Gallup/Getty Images

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What Are the Security Challenges? - South African officials say the normal seating capacity of Johannesburg's FNB stadium probably won't suffice to accommodate all mourners. Security for the event is likely to be tight as the list of presidents, heads of government, royalty and celebrities keeps growing by the hour.The South African government said Sunday a total of 53 heads of state, government and ministers have confirmed they will be attending the service. Here's a selection of confirmed attendees.(Photo: Jeff J Mitchell/Getty Images)

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President Obama - U.S. President Obama and First Lady Michelle Obama as well as former presidents George W. Bush, Bill Clinton and Jimmy Carter.(Photo: Alex Wong/Getty Images)

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U.N. Secretary General Ban Ki-moon and Predecessor Kofi Annan - (Photo: Haraz N. Ghanbari/Pool/LANDOV)

Photo By Photo: Haraz N. Ghanbari/Pool/LANDOV

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British Prime Minister David Cameron - (Photo by Dan Kitwood/Getty Images)

Photo By Photo by Dan Kitwood/Getty Images

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French President Francois Hollande - (Photo: Antoine Antoniol/Getty Images)

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German President Joachim Gauck - (Photo: Guido Bergmann/Bundesregierung-Pool via Getty Images)

Photo By Photo: Guido Bergmann/Bundesregierung-Pool via Getty Images

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Robert Mugabe, President of the Republic of Zimbabwe - (Photo: Jeff Zelevansky/Getty Images)

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Canadian Prime Minister Stephen Harper - (Photo: Jag Gundu/Getty Images)

Photo By Photo: Jag Gundu/Getty Images

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Spanish Prime Minister Mariano Rajoy and Prince Felipe - (Photo: Carlos Alvarez/Getty Images)

Photo By Photo: Carlos Alvarez/Getty Images

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Brazilian President Dilma Rousseff and Former President Luiz Inacio Lula da Silva - (Photo: Ueslei Marcelino/Landov)

Photo By Photo: Ueslei Marcelino/Landov

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Indian President Pranab Mukherjee - (Photo: Simon Dawson - Pool/Getty Images)

Photo By Photo: Simon Dawson - Pool/Getty Images

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Australian Prime Minister Tony Abbott - (Photo: Chris Jackson/Getty Images)

Photo By Photo: Chris Jackson/Getty Images

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The Netherlands' Foreign Minister Frans Timmermans and King Willem-Alexander - (Photo: FGA/Landov)

Photo By Photo: FGA/Landov

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Danish Prime Minister Helle Thorning-Schmidt - (Photo: Chris Jackson/Getty Images)

Photo By Photo: Chris Jackson/Getty Images

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Norwegian Prime Minister Erna Solberg and Crown Prince Haakon - (Photo: Ragnar Singsaas/Getty Images)

Photo By Photo: Ragnar Singsaas/Getty Images

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Czech Foreign Minister Jan Kohout - (Photo: Hoang Dinh Nam/Pool/Landov)

Photo By Photo: Hoang Dinh Nam/Pool/Landov

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European Commission President Jose Manuel Barroso - (Photo: David Ramos/Getty Images)

Photo By Photo: David Ramos/Getty Images

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European Union Council President Herman Van Rompuy - (Photo: Alexey Filippov/Host Photo Agency via Getty Images)

Photo By Photo: Alexey Filippov/Host Photo Agency via Getty Images

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Top Vatican Official Cardinal Peter Turkson of Ghana - (Photo: Franco Origlia/Getty Images)

Photo By Photo: Franco Origlia/Getty Images

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Slovak Foreign Minister Miroslav Lajcak - (Photo: PA PHOTOS/LANDOV)

Photo By Photo: PA PHOTOS/LANDOV

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Liberian President Ellen Johnson-Sirleaf - (Photo: Finbarr O'Reilly / Reuters)

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Haiti's Prime Minister Laurent Lamothe - (Photo: Carl Court - WPA Pool/Getty Images)

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Nepal's Foreign Minister Madhav Prasad Ghimire - (Photo: Zhou Shengping/XINHUA/LANDOV)

Photo By Photo: Zhou Shengping/XINHUA/LANDOV

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Sri Lanka's President Mahinda Rajapaksa - (Photo: Chris Jackson/Getty Images)

Photo By Photo: Chris Jackson/Getty Images

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Bangladesh's President Abdul Hamid - (Photo: Matthew Lloyd/Getty Images for 9th World Islamic Economic Forum)

Photo By Photo: Matthew Lloyd/Getty Images for 9th World Islamic Economic Forum

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The Group of "Elders" Says Goodbye to Founder - Former Finnish President Martti Ahtisaari and former Irish head of state Mary Robinson as part of the delegation of The Elders, a group of former statesmen which Mandela helped to launch.(Photo: Chung Sung-Jun/Getty Images)

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British Entrepreneur Richard Branson - (Photo: Dave Benett/Getty Images)

Photo By Photo: Dave Benett/Getty Images

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World leaders to be included in opening remarks and interfaith prayers. - (Photo: UPI/Charlie Shoemaker/LANDOV)

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Namibian President Hifikepunye Pohamb - (Photo: REUTERS/Ray Stubblebine)

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Mandela Family Friend Andrew Mlangeni - (Photo: SIBONGILE NGALWA/LANDOV)

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Third generation of Mandelas to lead tributes - Tributes to be given by the former leader's grandchildren Mbuso Mandela, Andile Mandela, Thanduxolo Mandela. Zozuko Dlamini and Phumla Mandela. (Photo: REUTERS/Themba Hadebe/Pool)

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African Union Commission Chairwoman Nkosazana Dlamini Zuma - (Photo: REUTERS/Tiksa Negeri)

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Chinese Vice President Li Yuanchao - (Photo: Lintao Zhang-Pool/Getty Images)

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Cuban President Raul Castro - (Photo: Diego Azubel - Pool/Getty Images)

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South African President Jacob Zuma - (Photo: Duif du Toit/Gallo Images/Getty Images)

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Bishop Ivan Abrahams to Lead Sermon - (Photo: Courtesy of John C. Goodwin/Methodist Church of Southern Africa)

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Nigerian President Goodluck Jonathan - (Photo: Godwin Omoigui/AP Photo)

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Kenya's President Uhuru Kenyatta - (Photo: Khalil Senosi/AP Photo)

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Democratic Republic of Congo President Joseph Kabila - (Photo: Tiksa Negeri/Reuters)