The oldest monument of Sochaczew is located on a hill on the border of Bzura. From the former castle today only ruins can be visited. The object is under the supervision of the conservator of monuments. Ruins are landscaping and look particularly attractive after sunset.
The remains of the castle are best preserved in the walls of the west wing, with magnificent window openings and fragments of the south-eastern wing with part of the tower. There is also a moat, unfortunately without water.
The exact date of creation is not fully known. Archaeological excavations are estimated to be 14th century. The name of the fortress is due to the congress of Mazovian princes, during which the law was established.
The big problem of the fortress was the low stability of the land, which caused most of the wall to collapse. Despite many attempts to rebuild it failed to restore its former glory. At present the slopes are protected against further sliding, partly reconstructed walls, paved courtyard, and additionally installed backlight.