Hundreds of thousands of people crowd Copacabana Beach in Rio de Janeiro on Sunday as Pope Francis celebrates the final Mass of his visit to Brazil. Security lapses, traffic chaos and other logistical snafus marred the visit. AFP/Getty Images hide caption

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A demonstrator is shot by a rubber bullet as anti-riot police officers charge during a protest Thursday against corruption and price hikes in Rio de Janeiro. Christophe Simon /AFP/Getty Images hide caption

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Mountains in the area where Marcelo first explored the wonders of the natural world. Leonardo Pallotta/Flickr hide caption

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