Three photos show the Olympic flame slowly extinguishing at London's Olympic Stadium, as the London 2012 Games come to an end. The next Summer Olympics will be in Rio de Janeiro, Brazil. Damien Meyer/AFP/Getty Images hide caption

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Gabby Douglas sits in the Olympic Media Lounge at Westfield Stratford City in London. During the Olympics, Douglas' Facebook fanbase grew by nearly 4,000 percent. Alex Grimm/Getty Images for adidas hide caption

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Sir Chris Hoy of Great Britain cries as he celebrates winning the men's keirin track cycling final. In shedding Olympic tears, Hoy was far from alone in Britain. Pascal Le Segretain/Getty Images hide caption

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Fireworks explode at London's Olympic Stadium during the closing ceremony of the Summer Olympics. The gala has gotten good reviews — with the exception of those troubled by NBC's presentation. Thomas Coex/AFP/Getty Images hide caption

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In an iconic moment, Gabrielle Douglas performs on the balance beam during the artistic gymnastics women's individual all-around competition at the 2012 Summer Olympics in London. Gregory Bull/AP hide caption

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Phelps dives into the pool for his last Olympic race. He says that his plans for post-Olympic life include finally seeing the cities he's competed in. Al Bello/Getty Images hide caption

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Elodie Clouvel of France shoots in the combined running/shooting event during the modern pentathlon World Championships in May in Rome, Italy. She'll compete in the Olympics Sunday. Paolo Bruno/Getty Images hide caption

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Usain Bolt of Jamaica celebrates his relay team's world record by doing the "mobot" move, made famous by Mo Farah of Britain. Bolt crossed the finish line in front of Ryan Bailey of the United States. Mike Hewitt/Getty Images hide caption

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Brigetta Barrett competes in the women's high jump final Saturday in London's Olympic Stadium. She won the silver medal. Stu Forster/Getty Images hide caption

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Mo Farah of Great Britain celebrates as he crosses the finish line to win gold ahead of Dejen Gebremeskel of Ethiopia and Thomas Pkemei Longosiwa of Kenya. Farah, who has become a celebrity in Britain, is the sixth man to win both the 5,000m and 10,000m distances at one Olympics. Michael Steele/Getty Images hide caption

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Oribe Peralta of Mexico celebrates scoring his second goal as Mexico beat Brazil, 2-1, to win Olympic gold medal in London's Wembley Stadium. Michael Regan/Getty Images hide caption

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