Frombork is a town in northern Poland, situated on the Vistula Lagoon in Braniewo County, within Warmian-Masurian Voivodeship. As of December 2021, it has a population of 2,260.The town was first mentioned in a 13th-century document. In the early 16th century it was the residence of the astronomer Nicolaus Copernicus, who used it as a site for several of his observations.
The town and its 14th century cathedral were badly damaged in World War II. After the war the cathedral was meticulously reconstructed and is again a popular tourist destination, listed as a Historic Monument of Poland.
Wikipedia https://en.wikipedia.org/wiki/Frombork
Coordinates 54°21'30.108" N 19°40'56.532" E