BRAZIL
MARIO TAMA/GETTY
Rio de Janeiro—A resident skates down a hallway of a building in the Mangueira favela on July 12. This deeply poor shantytown is half a mile from Maracanã Stadium, where the opening and closing ceremonies of the 2016 Olympics will take place. In the lead-up to the games, Brazil has spent hundreds of millions of dollars sprucing up the stadium. Brazilian lawmakers promised to do the same for the slums, but little has happened. More than 20 percent of Rio’s population lives in slums, where running water is scarce and gang violence is a daily threat.