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 Dutch windmill in Palczewo

Heading towards Ostaszewo, on the right you will see a uniquely shaped, brick and wooden Dutch windmill from the middle of the 19th Century.

Traditional Dutch windmills were constructed permanently on the ground and sometimes on other buildings, as was the case with the now non-existing structures in Drewnica and Wikrowo; they contained at least three storeys. The four-storey windmill in Palczewo has brick, accessible foundations, which contain store rooms, and the tower is covered with a wooden shingle. The sails of the windmill rotate with the wind with the help of a turbine mounted inside.

Even before the Second World War the windmill in Palczewo was considered a technological monument, despite that fact that it was also being used after the War. In front of the windmill there is a house built in 1859, which contains a decorative porch made by a carpenter.