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 Gdańska Głowa Watergate

The Gdańska Głowa Watergate was constructed on the Szkarpawa River in 1895, a part of the Vistula River engineering works.

It allows sailing on the Szkarpawa and, at the same time, protects Żuławy from flooding. Formerly, next to the Watergate, there was a famous fortress that was the target of countless attacks, as whoever controlled this place governed commercial traffic from Poland to Gdańsk and Elbląg.

The fortress was constructed on the cape between the Wisła Gdańska and Szkarpawa and it played the strategic role of a post defending Gdańsk. The fortress had existed here in the 16th and 17th Centuries. By the end of the 17th Century (after the Peace of Oliwa) it was destroyed and its remains finally disappeared during the works on the Przekop Wisły. Today there is farmland on this site.