Cathedral Hill (Wzgórze Katedralne) is the collective name for Frombork’s famed complex and consists of a medieval cathedral, bishopric palaces, diocesan chanceries, defensive walls, towers and keeps. Dating from at least the 14th century, this was where Copernicus was believed to have worked, and is therefore something of a shrine for Copernicus fans the world over. Remarkably, Cathedral Hill was practically the only part of Frombork left standing at the end of the Second World War.
With few explanations in English you might wish to consider using a tour guide. Local expert Stanisław Kuprjaniuk is the very man for the job and also does tours in German. Call him in advance one day before you want to visit on tel. 609 68 33 13.