It is ruins of those strengthening which erected princes of Lyubomirskie in XVII age. At Lyubomirskikh of strengthening Polonnogo had the following kind: the mean of market-place, near a lock, is worn out was around a large billow with the pointed oak palisades; deep ditches, gap-filling water, are around conducted. At an entrance scarfwise from three sides there were suspension liftings bridges which with the offensive of night, rose. The cossacks of M. Krivonosa may need three days of bitter fights, to take a fortress and prang it. A lock was not restored anymore, and only the saved fragments of earthen billows are reminded about his existence.