At 25 sq km, the Lainzer ‘Zoo’ is the largest (and wildest) of Vienna’s city parks. The former hunting ground of Ferdinand I, over 80% of it is covered in woodland. Take in the view from Hubertus-Warte, a 508m-high viewing platform on top of Kaltbründlberg or scout for the park’s animal population, from deer and wild boar, to woodpeckers and squirrels.