The Olympic rings are illuminated during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Fireworks illuminate the sky over Olympic Stadium during Opening Ceremonies at the 2012 Summer Olympics, Saturday, July 28, 2012, in London.

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A general view of the Opening Ceremony of the 2012 Olympic Summer Games at the Olympic Stadium in London, Friday, July 27, 2012.

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Flags of various countries hang in the foreground as athletes march in the Olympic Stadium during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Fireworks light up over the stadium during the Opening Ceremony at the 2012 Summer Olympics, Saturday, July 28, 2012, in London.

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A speedboat carrying the Olympic Flame leaves a trail on this slow exposure photograph as fireworks explode above the iconic Tower Bridge over the River Thames in central London, decorated with Olympic rings, during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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The iconic Tower Bridge over the River Thames in central London, decorated with Olympic rings, is seen in this zoom exposure, during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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The speedboat, bottom left, carrying the Olympic Flame, heads to Tower Bridge during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Fireworks illuminate the sky over the Tower Bridge and River Thames in London during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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The North Korean Olympic team arrives during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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The Olympic rings are lit with pyrotechnics during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Actors hold illuminated rods and perform during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Artists perform during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Artists perform during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Actors take flight during a performance at the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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An actor takes flight during a performance at the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Actors perfrom during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Actors dressed as Mary Poppins perform during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Actors perform during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Performers play drums during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Members of the audience watch a performance during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Performers dance during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Snow Patrol perform at the Opening Ceremony Celebration Concert in Hyde Park, London, Friday, July 27, 2012. The concert is part of a series of events being organised by the Mayor of London, Boris Johnson, to celebrate the London 2012 Olympic Games.

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Fireworks explode during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Artists perform during the Opening Ceremony of the 2012 Olympic Summer Games at the Olympic Stadium in London, Friday, July 27, 2012.

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Actors perform during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Artists perform during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Artists perform during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

Associated Press

Artists perform during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

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Performers dance as videos are projected onto a structure during the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London.

Associated Press