The small, one-nave church of Saints Barbara and Valentine in Siewierz was built in 1618, as an infirmary church. It replaced the previous wooden structure standing on the same site. Inside the church, there is the equipment from the first half of the seventeenth century, among which it is worth paying attention to the Baroque altars. The portraits of the main patron saints of the church, Saint Barbara of Nicomedia and Saint Valentine are placed in the high altar.