Between 1625 and 1635, this UNESCO-listed residence was built for Johann Ulrich von Eggenberg. Its unique decoration depicts an allegory of the universe: four towers, 365 windows and 24 state rooms, with 52 windows. In addition to the halls, you can also visit the Alte Galerie, which boasts an overview of Austrian and European art (13-18C), the Medal Collection, the Archaeology Museum, the centrepiece of which is the cult Strettweg Chariot, and the aromatic Planet Garden.