U.S. President Barack Obama, accompanied by Israeli President Shimon Peres and Prime Minister Benjamin Netanyahu, visits the Yad Vashem Holocaust memorial in Jerusalem, Israel, on March 22, 2013. At the memorial, Obama said there is a collective obligation of the world to act against racism and anti-Semitism. Obama is in the final day of his three-day visit to Israel and the Palestinian Territories. UPI/Amos Ben Gershom/GPO