These three powerful abandoned FORTS connected by a system of shafts and ditches in a group called "Home Protection". Be a fragment of XIX century fortifications of the district łomżyńskiego. In contrast to the classical fortresses fortowych, these objects are combined in a continuous line of defense: the ramparts, the ditches next to the road for rapid deployment of troops and supplies as well as storage passive and combat.
FORTS began to be built in 1887. In the beginning it was a cold redoubts (closed, independent work, field fortification and semi-solids), but later three of them were completed, among other things, adding elements of concrete. Responsible for the construction of a Russian General Alexei Szoszin (1861-1924), which is planned to increase the construction of new FORTS. None of this, however, did not work, and in 1909 the castle was destroyed. The FORTS were originally designated 1 (East), 2 (middle) and 3 (West), and was later renamed in accordance with the Russian alphabet, A, B, V.
In 1939 the Polish Army strengthened the fortifications, built on the ramparts of the shelters the twelve positions of the machine guns. Strengthening this was the main point of resistance of the Polish troops in the northeast during September campaign (1939). Strengthening in Piątnicy was a modern, unified military complex, with zwielokrotnionym covering fire assumption, especially roads leading to the city. Each Fort had an individual, asymmetrical construction. At present the Fort is abandoned and not in use.
There is a legend that is unexplored is still a tunnel leading under the river and connecting the fortress with the nearby convent of the Capuchin fathers. Hope, however, that this is just fictional nonsense: creating this type of tunnel would be like in those days, very hard and made no sense.
The second legend says that after the SECOND world War the FORTS were a place of storage of dead UB members of the anticommunist opposition. Apparently, part of the underground sidewalks were bricked up, and it is possible that today there are buried human remains. Here, however, such assumptions are not confirmed in the available archival material, and the fortifications were not discovered any traces, evidence zamurowaniu part of shelters or tunnels.