Decades ago, the border fence near the port of entry at Nogales, Ariz., and Nogales, Mexico, was made of wire mesh. Now it's a thick steel wall covered with graffiti. Loosely translated, this part of the wall says "Walls Equal Death," although the end of the phrase is not shown. Claudio Sanchez/NPR hide caption

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Maria Luisa Aragon was killed in Juarez, Mexico, on Dec. 9, 2009, in a case of mistaken identity. She is among the 30,000 victims of Mexico's brutal drug war. Courtesy of the Aragon family hide caption

itoggle caption Courtesy of the Aragon family

Tanya Lozoya's parents stand by a mural of their daughter in her softball uniform, painted in the backyard of their home near El Paso, Texas. A stray bullet killed the teenager on May 16, 2009, while she attended a baptism party in Juarez, Mexico. She is one of more than 30,000 casualties in Mexico's drug war. Monica Ortiz Uribe for NPR hide caption

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Vineyards, like Montgras in Santa Cruz, Chile, are beginning to figure out how much fine wines contribute to climate change. Joe Raedle/Getty Images hide caption

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In the early 1900s, Machu Picchu -- an Inca site perched high in the Andes mountains -- was well known to locals, but largely forgotten internationally. In 1911, explorer Hiram Bingham wrote about the site in National Geographic magazine and refocused international attention on the ruins. Eitan Abramovich/AFP/Getty Images hide caption

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U.N. forces try to calm the crowd outside an election center in Petionville, a suburb of Port-au Prince, on Dec. 9. Supporters of Michel Martelly, who failed to qualify for an election runoff in results announced by Haitian electoral authorities, took to the streets of Haiti's capital in three days of unrest last week to contest the election results. David Gilkey/NPR hide caption

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Tourists and locals sit on a wall along the waterfront in Havana; Aug. 25, 2010. Stringer/AFP/Getty Images hide caption

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Camp residents stand in line at a water distribution site at the old military airport in Port-au-Prince, Haiti, on Friday. David Gilkey/NPR hide caption

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Fires burn on the streets of Petionville, outside of Port-au-Prince Haiti, Dec. 7, 2010 David Gilkey/NPR hide caption

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Supporters of Haitian presidential candidate Michel Martelly jump over burning items during a protest Tuesday in Port-au-Prince. Ramon Espinosa/AP hide caption

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Argentina's President Cristina Fernandez de Kirchner is among the subjects of U.S. diplomatic cables about Latin America leaked by WikiLeaks. Some of the cables speculated about the mental and physical health of regional leaders, such as Fernandez de Kirchner. Yuri Cortez/AFP/Getty Images hide caption

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