The funeral of the last heir to the Austro-Hungarian Empire, Otto von Habsburg, has taken place in the Austrian capital Vienna.European royals and political leaders, many from nations that his family ruled over, attended the service.The body of the last crown prince was buried in the Imperial crypt at a private ceremony. His wife, who died last year, was buried alongside him.Thousands of Austrians and tourists lined the streets of Vienna’s city centre ahead of a procession into St Stephen's Cathedral, where about 1,000 mourners had gathered.Bethany Bell reports from Vienna.