BBC wrote:
Forty-eight hours of celebrations are taking place to mark nine new states joining a European border-free zone.
The Schengen agreement, which allows passport-free travel across the area, now embraces 24 nations.
Some 2,000 people celebrated in the town of Frankfurt on Oder at Germany's border with Poland, amid fireworks and the EU anthem, Beethoven's Ode to Joy.
The Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia, and Slovenia joined the zone.
Speaking in Zittau, close to where Germany, Poland and the Czech Republic meet, German Chancellor Angela Merkel said it was a "truly historic moment".
Mrs Merkel was joined by Polish Prime Minister Donald Tusk, his Czech counterpart Mirek Topolanek and European Commission President Jose Manuel Barroso.
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