Nineteen-year-old Bosnian Serb Gavrilo Princip fired the shots that killed the heir to the Austro-Hungarian empire, Archduke Franz Ferdinand, and his wife, Sophie, during a visit to Sarajevo on June 28, 1914. Depending on whom you ask, he's either a hero or a terrorist. Historical Archives Sarajevo/AP hide caption

itoggle caption Historical Archives Sarajevo/AP

A military amphibious vehicle heads down a flooded street in Obrenovac, Serbia. Residents were preparing for a river surge Monday that threatened to inundate Serbia's main power plant. Darko Vojinovic/AP hide caption

itoggle caption Darko Vojinovic/AP

Relatives of Rizo Mustafic react after the Dutch Supreme Court ruled the Netherlands was responsible for the deaths of Mustafic and two other Bosnian Muslim men during the Srebrenica massacre in 1995. Martijn Beekman/EPA /LANDOV hide caption

itoggle caption Martijn Beekman/EPA /LANDOV

July 11, 2012: A woman cried next to the coffin of her relative at the Potocari memorial complex near Srebrenica. More than 8,000 Muslim men and boys were executed there in July 1995. It was the worst massacre in Europe since World War II. Marko Drobnjakovic/AP hide caption

itoggle caption Marko Drobnjakovic/AP