In the Diocesan Museum we will find a collection of paintings, sculptures and decorative arts (including a collection of over 100 robe belts in a specially designed cabinet) and the priceless monuments of religious art, including sixteenth-century Herm of St. Zygmunt - the patron of Płock, cup of Prince Konrad or chalice of Ferdinand Vasa.

The exhibition is divided into three parts. Christ in Art: painting and sculpture, Christ in the Eucharist and Christ in the lives of the saints.

Treasury Museum is one of the five richest in Poland.