One of the most visible buildings in town, the castle was built in 1499 for Emperor Maximilian I. The Burg is devoted exclusively to offices of the Austrian and Styrian provincial governments and is not open to visitors. However, it does contain an unusual winding staircase, the Wendeltreppe, whose corkscrew (helix) shape is a marvel of medieval stonework. The concierge will usually allow visitors in for a peek.