The Olsztyn Castle was built in the 14th century as the seat for administrators of the Warmia Chapter’s estates. In Olsztyn, in the years 1516–1521, this function was performed by Nicolaus Copernicus. To this day, on the gallery wall there remains a unique memento of his stay – a hand-made experimental astronomical table. This presentation is intended to familiarize you with the past and present of the Castle.