In 1959, Fidel Castro imposed a law forbidding the import of foreign cars, so many Cubans drive and maintain older models. Kate Skogen/JetKat Photo hide caption

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Iranian women look at the palace of King Darius of Achaemenid Persepolis, near Shiraz in southern Iran. Behrouz Mehri/AFP/Getty Images hide caption

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Haley Nordeen, 19, is spending the entire summer at the Prodesenh center in San Mateo Milpas Altas, Guatemala. The American University student helped build the center's new library. Carrie Kahn/NPR hide caption

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