Frombork is famous not only for the castle but also because of the cathedral and the person of Nicolaus Copernicus as this is the place where he worked and created his modern model of outer space. The construction of both the castle and cathedral started in 1275. Right now the most precious is the cathedral hill where, apart from the cathedral and the castle, you can visit Nicolaus Copernicus Museum with many astronomical instruments, visit the planetarium and watch the stained glass window exhibition. What is more, every year many tourists come to Frombork to experience the Organ Music Festival, as Frombork organs are believed to be one of the five the best organs in the country. After castle sightseeing, it is also nice to take the stroll to the Frombork harbour.