Top 10 moments from London Olympics

  • U.S. swimmer Michael Phelps poses on the podium with the gold medal after winning the men's 4x100 medley relay final at the London 2012 Olympic Games on August 4, 2012 in London. It marks Phelps' 18th gold medal, a new record. FABRICE COFFRINI/AFP/Getty Images

    1. Crowning the most decorated Olympic athlete of all time

    Michael Phelps ended his remarkable swimming career by winning four gold and two silver medals in London. He is now the most decorated Olympian ever, with a career total of 22 medals, 18 of them gold. In his final swim, he helped the U.S. reclaim the lead in the 4x100-meter relay, and afterward he got a special trophy from swimming officials that said: "To Michael Phelps, the greatest Olympic athlete of all time."