The Alfred P. Murrah Federal Building was "literally right up against the road so it was extremely vulnerable," said architect Barbara Nadel. One of the government's first responses was to close a two-block stretch of Pennsylvania Avenue in front of the White House. AFP/AFP/Getty Images hide caption

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"There hasn't been a change of the portraits since 1929 ... it's time to bring our money into the 21st century," says Susan Ades Stone, spokeswoman for Women on 20s. iStockPhoto hide caption

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Salvadoran Gen. Carlos Eugenio Vides Casanova, shown in an undated photo, is alleged to have presided over human rights violations in that country, including the murders of four Americans in 1980. AP hide caption

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Then-U.S. Secretary of State Hillary Rodham Clinton (center) types on her cellphone with Roberta S. Jacobson, U.S. assistant secretary of state for Western Hemisphere Affairs (left), and U.S. Ambassador to Brazil Thomas Shannon in Brasilia, Brazil, before heading to Brussels in 2012. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP