The Słupia, the Radunia, and the Wierzyca are rivers whose location and energy of water flow was taken advantage of to build hydroelectric power plants. Many of them are still operating and can be visited. The oldest such power plant in Europe, Struga, or the Radunia’s highest-situated plant in Bielkowo, are only a few of the facilities well worth seeing. The principles of physics, chemistry, and mathematics are contained in machines and post-industrial sites, and presented at thematic exhibitions, such as in the Hewelianum Centre.
The post mill in Drewnica
Drewnica is a real, living antique building museum of the architecture in Żuławy. What is peculiar about the village is the several dozen buildings of local architecture, including one of the few remaining windmills in Żuławy.
The history of Drewnica reaches mediaeval times, when it was granted town status in 1359 by the Teutonic Knights under the Chełm law as a Church village. The village survived numerous wars, such as its destruction during the wars with Sweden in the 17th Century. Despite that fact, several dozen wooden houses and farm buildings from the 19th Century have survived to this day. Many of them are true masterpieces of local architecture. The attention is drawn to the beautiful architectural details in the form of the so-called "laubzekins" (a type of wooden laces). The wooden post windmill (Polish: "koźlak") was built in 1718. It stands on a special construction called the post, which spins it according to the direction of the wind. It of course has not performed its function for a long time; however, it is currently being renovated by its owner and has become a great tourist attraction. It is the only post windmill in Żuławy. In the past there was also a tower mill in the village, built in the middle of the 19th Century, but it burned down in 1989.
Foto. M.Bielinski, Dep. Turystyki, UMWP