The interior of the temple in Byszew is made of wood, polychromed with a main altar, decorated with gilded ornaments, which is a binding for the first half. The seventh century image of the Virgin Mary with the Child. It is one of the oldest images of Our Lady in Poland. The second side of the picture is decorated with a 15th century painting depicting the martyrdom of St. Bartholomew.
Other valuable sights include two side altars, a richly decorated rococo pulpit, and a Romanesque granite baptismal font from the 17th century. Numerous artisanal items of liturgical character are preserved in the church as well as rococo sculptures and paintings.
The temple in Byszewo was built at the turn of the 15th and 16th century in place of the 13th century wooden church, destroyed by the Teutonic Knights. In the 18th century, the one-nave church was expanded with two side chapels and richly decorated openwork, gilded decorations of the choir. Most of the decorations of this period can be admired to this day.