American swimmer Michael Phelps has become the most decorated Olympian in history.
Olympic Swimmer Michael Phelps

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US swimmer Michael Phelps poses after receiving the trophy of the greatest olympic athlete of all time after winning gold in the men's 4x100m medley relay final during the swimming event at the London 2012 Olympic Games on August 4, 2012 in London.

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A girl prays during Eid el-Kebir at a mosque in Koumassi, in the Ivorian capital Abidjan. Muslims around the world celebrate Eid el-Kebir, also known as Eid al-Adha, by slaughtering sheep, goats, camels and cows to commemorate Prophet Abraham's willingness to sacrifice his son, Ismail, on God's command.

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US swimmer Michael Phelps (C) reacts with teammates Brendan Hansen, Nathan Adrian and Matthew Grevers after they competed in the men's 4x100m medley relay final during the swimming event at the London 2012 Olympic Games on August 4, 2012 in London.

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Michael Phelps of the U.S. swims the butterfly leg of the men's 4x100m medley relay final during the London 2012 Olympic Games at the Aquatics Centre August 4, 2012.