The gothic church of St. John the Baptist was built in the fifteenth century, probably on the site of a former castle’s chapel, demolished along with the castle during the rebellion of the burghers in 1454. Some researchers, however, claim that the temple was built along with the first location of the city in the years 1326 -1332, as a parish church, and when the town was translocated to the right bank of the river, it became an chapel of ease and hospital building. After 1466, it was restored after the destructions caused by the Thirteen Years’ War. Since the Reformation period, the church served as an Evangelical temple, in which sermons were delivered in Polish. Catholics adopted it again in 1946.
It is a single-nave, aisleless building on a rectangular plan with the porch from the south and the sacristy from the north side. The tower at the west facade is a nineteenth-century addition, created on the site of an earlier timber tower. The object is orientated, which means that its presbytery with the altar is facing east. The shorter sides of the nave, the sacristy and the porch are decorated with gothic stepped gables. The whole structure is reinforced by buttresses, between which there are pointed windows. The nave is covered with a timber, flat ceiling.
Webpage Leksykon kultury Warmii i Mazur, Kościół pw. św. Jana Chrzciciela w Bartoszycach.