Built at the beginning of the 17th century as part of the palace and park complex, the castle chapel served sacred functions until 1945. Being part of the palace and park complex in Koszęcin, the castle chapel (also known as the church) is built on a rectangular plan with an apse on the north side.
Today, a renovated and restored chapel, dedicated to Our Lady of the Assumption and St. Męczenników Dionysego and Witalis, is a beautiful place in the palace and park complex, which is the seat of the Song and Dance Ensemble "Śląsk". It houses the Chamber Concert Hall, which hosts chamber concerts.