Uhrturm (und Schlossberg)

Uphill, it is recommended to climb up the stairs from Schlossplatz. The other two well-usable ascents / descents are direction Paulustorgasse (also illuminated at night) and Wickenburggasse (at night unlighted and unaccompanied NOT recommended)

As Flo says, the paths are partly unlighted at night, which can quickly lead to a confusing slide, especially in the autumn in wet and deciduous trees. Otherwise worthwhile view over the city, especially at night.