Burg and Double Spiral Staircase Graz | Graz Tourismus https://www.graztourismus.at/graztourismus/de/sightseeing-kultur/sehenswuerdigkeiten/grazer-burg-doppelwendeltreppe_shg_1444
The Double Spiral Staircase is a masterpiece of stone masonry from late Gothic period. It belongs to the Burg, seat of the Styrian regional parliament.
ruled over Inner Austria, an association of territories reaching as far as Istria, Trieste