The pentagonal defensive tower on a rock over the river of Zhvanchik - everything that remains from there is no time mighty Zhvanetsky of the lock. It has been built in нач. 17 century, however the first strengthenings here have arisen much earlier. In 15 century Lithuanians carried out reconstruction of ancient strengthenings. The new Polish fortress which had 5 towers, competed in the sizes with Kamenets-Podolsk. In 1653 during a siege of Zhvantsa B.Hmelnitsky betrayed by Tatars, has made decision to conclude a military alliance with Moskovia and has gone from here on negotiations in Perejaslav. In a end. 17 century the lock some times was exposed to destructions during polsko-Turkish war. The government of Russia planned to construct here the big fortress, but these plans and have not been carried out. In due course the lock has decayed and almost has been completely disassembled.