Berlin's mayor Klaus Wowereit (C) arrives to give a press conference on August 26, 2014 at the city hall in Berlin. Wowereit, who famously dubbed his city "poor but sexy" and presided over its rise as an arts and party capital, announced that he will step down in December 2014.     AFP PHOTO / ODD ANDERSEN        (Photo credit should read ODD ANDERSEN/AFP/Getty Images)