German Chancellor Merkel speaks at the exhibition opening during a ceremony marking the 25th anniversary of the fall of the Berlin Wall at a memorial in Bernauer Strasse in Berlin

German Chancellor Merkel speaks at the exhibition opening during a ceremony marking the 25th anniversary of the fall of the Berlin Wall at a memorial in Bernauer Strasse in Berlin

German Chancellor Angela Merkel speaks in front of a photograph showing Bernauer Strasse in November 1989 at the exhibition opening during a ceremony marking the 25th anniversary of the fall of the Berlin Wall at a memorial in Bernauer Strasse in Berlin, November 9, 2014. REUTERS/Fabrizio Bensch (GERMANY – Tags: POLITICS ANNIVERSARY SOCIETY)