10 years have passed and I haven`t written about Frombork? Incredible. Frombork ([ˈfrɔmbɔrk]; German: About this sound Frauenburg (help·info)) is a town in northern Poland, on the Vistula Lagoon, in Braniewo County, Warmian-Masurian Voivodeship. It had a population of 2,528 as of 2005.
The town was first mentioned in the 13th century. 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 700-year-old cathedral were badly damaged in World War II. After the war the cathedral was meticulously reconstructed and is again a popular tourist destination.
Frombork is known as “The Jewel of Warmia” because of its many historical sites. The Museum of Copernicus in Frombork  holds exhibitions related to the astronomer, as well as to astronomy in general, and includes a planetarium. One of the biggest attractions is also the annual International Festival of Organ Music, held every summer. Between 1975 and 1998 the town was part of the Elbląg Voivodeship.