The fifth-graders from L.A.'s Pico Union neighborhood, who rarely get to spend time in nature, say it was the best field trip ever. Mandalit del Barco/NPR hide caption

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Anti-government protesters rest on their collapsed tent following clashes with the police as they called for the resignation of President Ali Abdullah Saleh in Sanaa, Yemen. Ahmad Gharabli/AFP/Getty Images hide caption

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About a week after the opening ceremony of the 1996 Summer Games in Atlanta, a bomb went off in Centennial Park. Two died and more than 100 were injured, but the games went on. Pedro Ugarte/AFP/Getty Images hide caption

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Migrants ride on top of a northern bound train toward the U.S.-Mexico border in Oaxaca, southern Mexico, in March. Migrants crossing Mexico to get to the U.S. have increasingly become targets of criminal gangs who kidnap them to obtain ransom money. Eduardo Verdugo/AP hide caption

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NPR reporter Jason Beaubien walks on railroad tracks while reporting a story about the dangers that face Central American migrants in Tenosique, Tabasco, Mexico. David Rochkind for NPR hide caption

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Chef Lao Wei Xiong cooks up a carry-out order for foreign reporters in the kitchen at al Maida restaurant in Tripoli. NPR hide caption

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