Built by the Teutonic Knights in 1350, the Great Mill with its rising tiled roof is the grandest civil construction in Gdańsk. Until 1356 when the Radunia Canal was built, the mill was powered by slaves turning 18 huge wheels. It was the largest industrial plant in Europe during the Middle Ages and functioned until the end of WWII. Unfortunately, this treasure has since been turned into a shopping centre. At least there's a small exhibition of old equipment from the mill. The surrounding grain and flour stores, dating to 1400, are home to a few small shops.
References:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.