The stronghold, locally called "Szwedzka Góra", is one of the most important places related to the beginnings of the Polish state. The whole area, including embankments and moats, covers an area of approx. 2 ha. Based on the results of the local archaeological excavations, a reconstruction project was prepared for the castle from its greatest splendor. Efforts are being made to fully reconstruct it.
Initially, the town was inhabited by the tribe of Łęczans. In the 12th century, Bolesław Krzywousty conquered the castle, then rebuilt it after the destruction and strengthened it. The times of its glory have begun. Grodzisko became the seat of Prince Konrad of Mazowiecki and his successors. After Kazimierz Wielki built the castle in Łęczyca, the stronghold began to gradually lose its importance.
In the Middle Ages, the stronghold performed important administrative functions. According to the records of the chronicler Gall Anonymus, at the beginning of the 12th century, even the capital of the Kingdom of Poland was moved here for a short time.