In the hamlet of Kostryn, there is an original mound, probably from the Bronze Age. It is a small hill in the shape of a cone with a beveled top on the plan of an ellipse 24m on 17m, with a height of 4m, and the diameter of its terrace at the top is 8m.
On top of it a prism chapel built of river stone was erected. The building consists of three floors with recesses, is 3.5 m high and a square base with a side of 1m.
Where it is?