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This handout photo made available by the German government press office shows Pope Benedict XVI, German President Horst Koehler and Koehler's wife Eva Luise at the Sistine chapel in the Vatican where they attend a concert on December 4, 2009.  AFP PHOTO / HO / BUNDESREGIERUNG / GUIDO BERGMANN (Photo credit should read GUIDO BERGMANN/AFP/Getty Images)
This handout photo made available by the German government press office shows Pope Benedict XVI, German President Horst Koehler and Koehler's wife Eva Luise at the Sistine chapel in the Vatican where they attend a concert on December 4, 2009.  AFP PHOTO / HO / BUNDESREGIERUNG / GUIDO BERGMANN (Photo credit should read GUIDO BERGMANN/AFP/Getty Images)

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See inside Sistine Chapel

CNN's Ben Wedeman is allowed rare access inside the Sistine Chapel on the 500th anniversary of the ceiling's completion.

See inside Sistine Chapel

CNN's Ben Wedeman is allowed rare access inside the Sistine Chapel on the 500th anniversary of the ceiling's completion.