Spaniards celebrate the 50th anniversary of the Treaty of Rome in Madrid's Oriente Square. European Union leaders have gathered in Berlin for the bloc's 50th birthday celebrations, as German Chancellor Angela Merkel warned of the need to reform the EU's institutions. (Xinhua/AFP Photo)
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A photographer takes a picture of the Agbar tower building in central Barcelona as it is lit to celebrate the 50th anniversary of the Treaty of Rome March 23, 2007. (Xinhua/Reuters Photo)
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