German Chancellor and conservative Christian Democratic Union (CDU) leader Angela Merkel waves to the crowd after an election campaign rally in front of the ancient Roman city gate and UNESCO World Heritage site, the Porta Nigra (Black Gate), in Trier near the Luxembourg and French border September 4, 2013. Merkel is seeking a third term in a parliamentary election on September 22. REUTERS/Wolfgang Rattay (GERMANY - Tags: POLITICS ELECTIONS TRAVEL)