BERLIN (AP).- A painting of the Florence skyline that hung in Adolf Hitler’s Berlin apartment throughout World War II and was missing for decades went on show Thursday in an exhibition of works returned to the collection of a major German museum. The exhibition centers on 18 works returned to the Alte Nationalgalerie over the past decade, more than half a century since they were removed from its premises. It also uses official shipment and loan lists, photographs and other documents to show how these pieces were taken down from the museum walls to wind up on odysseys through flak towers, salt mines and water-soaked cellars. Many of these works found their way into private hands, but museum officials say a recent international push for restitution has resulted in an increase in the number of works returning to the museum in the past 10 years. “In recent years, attitudes have changed,” said Dorothea Kathmann, a legal expert with for the Prussian Culture Foundation. Efforts to trac