The first church in Wizna was a castle chapel already existed in 1300. The parish in Wizna was erected in 1390, and the second church, probably also a wooden, was built around 1400. The present church of St John the Baptist was built about 1500. It was founded by Anna, the Duchess of Mazovia. The construction, conducted by the parson of Wizna, and later by Jan Wojsławski, was completed in 1525. It was destroyed during the Swedish Deluge but was rebuilt in 1658. Repairs after the fire were carried out between 1705 and 1720. Between 1881 and 1884 the vaults were rebuilt and the vestry was enlarged. The church was demolished by the Germans in 1944 and rebuilt in 1951 – 1958.
The late Gothic church was erected from red bricks in the monk bond, and in the ground parts reinforced with matching erratic stones. It was set on the plan of an elongated rectangle with a rectangular chancel from east and sacristy from the north. It had no tower and corners and side elevations supported with prominent buttresses. The gable of the facade is stepped and triaxial, while the gable of the chancel is single-axial, with a high window and a chapel.
The interior of the church is pseudohall, with three aisles and four-bays. Three-bay chancel is closed by a straight wall with a stained glass window. The church has stellar vaults, six-pointed in the presbytery and eight-pointed in the central aisle. Stellar and net vaults are in the side aisles. The sacristy has two floors, the upper floor is accessible by stairs from the northern aisle and open to the chancel.
Kunkel R.M., Architektura gotycka na Mazowszu, Warszawa 2005.
Żabicki J., Leksykon zabytków architektury Mazowsza i Podlasia, Warszawa 2010.