CNN — A portrait by Gustav Klimt that was unseen for almost a century is expected to fetch millions when it goes up for auction this spring. The “Portrait of Fräulein Lieser,” thought to be one of the Austrian painter’s final works, is expected to fetch up to $54 million at a sale that has created huge excitement in the art world. The painting had long been considered lost, according to Vienna auction house im Kinsky. However, it has now emerged that it had been privately owned by an Austrian citizen. “The rediscovery of this portrait, one of the most...