Śluza Kamienna, Lock complex in Śródmieście, Gdańsk, Poland.
Śluza Kamienna is a lock complex in Śródmieście, Gdańsk, Poland, built from four stone towers, defensive walls, and earthen ramparts. The structure stands where the Motława meets its bypass canal, connecting different waterways across the area.
Dutch engineers Wilhelm Jansen Benningen and Adrian Olbrantsen designed the complex between 1619 and 1623 as part of Gdańsk's fortifications. The lock was meant to control water levels while protecting access to the city.
The name refers to the stone construction of the towers and walls, which was rare for waterworks in this part of Europe at that time. Visitors today can examine the massive stones laid without modern machinery that still hold their shape.
The lock sits in the central part of Gdańsk where the river changes course and is easy to reach from the city center. Visitors can explore the outer areas and view the towers from the banks, with a walk along the canal offering good overview.
Two small islands nearby called Pig Heads served as outposts for early warning of danger. The four towers were known as the Four Maidens and together formed a closed defensive line over the water.
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