The Academy of Fine Arts, or Akademie der Bildende Kunst, may not be one of Vienna's best known galleries, but the collection of paintings is nonetheless impressive and worth a visit. It concentrates on Flemish, Dutch and German painters including the disturbing Hieronymus Bosch, Rembrandt, van Dyck and Rubens. The highlight is Bosch's altarpiece Triptych of the Last Judgment from 1504 to 1508.
The Academy of Fine Arts still functions as an art school, so don't be surprised if you smell fresh paint. It has the distinction of being the school that rejected Adolf Hitler twice.