The Castle Museum on the 1st floor has exhibits on the history of Kőszeg from the 14th century (with the events of 1532 taking up most of the space) and on local wine production. Among the latter is the curious Szőlő jővésnek könyve (Arrival of the Grape Book), a kind of gardener's logbook of grape shoot and bud sketches begun in 1740 and updated annually on St George's Day (23 April). You can climb two of the towers, from where a brass ensemble entertained the townspeople in the Middle Ages.
