BERLIN - NOVEMBER 09: Visitors pass an open air exhibition near the still-existing section of the Berlin Wall at the Bernauer Strasse memorial on the 20th anniversary of the fall of the Wall on November 9, 2009 in Berlin, Germany. The city of Berlin is celebrating the 20th anniversary of the fall of the Wall, which led to the end of communist rule in East Germany and later on the reunification of East and West Germany, with a spectacular event at the Brandenburg Gate and the participation of international leaders.