A man walks past a campaign sign for Enrique Pena Nieto, of the opposition Institutional Revolutionary Party. Mexicans vote for their next president on Sunday. Esteban Felix/AP hide caption

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In heavily polluted Mexico City, crime writer Paco Ignacio Taibo II describes his exhausted detective Hector Belascoaran Shayne as looking out at his hometown and seeing "a city that was trying to hide itself in the smog." Ronaldo Schemidt/AFP/Getty Images hide caption

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PRI candidate Enrique Pena Nieto campaigns in Mexico City. Pena Nieto is heavily favored in Mexico's presidential election on Sunday. He says his party, which has been out of power for 12 years after ruling for seven decades, has changed its ways. John Moore/Getty Images hide caption

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On Thursday, the Mexican Navy presented Felix Beltran Leon (in red) as the son of Joaquin "El Chapo" Guzman, Jesus Alfredo Guzman Salazar. On Friday, Mexican and U.S. officials confirmed that Beltran's identity had been mistaken. Alfredo Estrella /AFP/Getty Images hide caption

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A man wearing a mask holds up a machete during a protest in May against a possible return of the old ruling Institutional Revolutionary Party in Mexico City. Eduardo Verdugo/AP hide caption

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Chef Javier Plascencia finds inspiration for his dishes at the Mercado Hidalgo, a huge indoor market in Tijuana Melanie Stetson Freeman/Christian Science Monitor/Getty Images hide caption

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