Between the Biebrza and Netta valleys, an old wild forest called Krasnybór was stretching. Since the beginning of the 16th century it belonged to a mighty house of Chreptowicze. Near the Biebrza they had their hunting house and founded a farm and village Krasnybór in its vicinity. Between 1548-1589 Adam Chreptowicz built an Orthodox church in Krasnybór which he gave to the Basilian monks brought here. It is the oldest and thus the most valuable sacral building of Suwałki Region. Its unique architecture is a combination of the Orthodox-Byzantine and European Gothic styles. The monastery buildings were built by the Basilians on the site of the present presbytery. In the 17th century the monastery was taken over by the Catholic Bernardine monks, and next, since 1684, by the Dominicans who stayed here till 1825. Nowadays, the church in Krasnybór is a branch of the parish in Sztabin. Precious units of its interiors are the 17th century paintings, especially the miraculous picture of the Virgin Mary with Her Child, and the sculpture of the Crucified Christ on the altar in the aisle.
Another priceless and beautiful church building in this region is a late-Renaissance monastery in Sejny re-built in the 18th century. Its splendid church (now a basilica) was re-built in the Vilnius Baroque style in 1760. The monastery preserved its character of a defensive castle with corner towers. The interiors of the church have eleven Baroque and Rococo altars with precious paintings. The Gothic case Madonna, one of six such relics in Europe, from the end of the 14th century is of priceless value.
The third jewel of sacral architecture in Suwałki Region is the Baroque monastery in Wigry, built between 1694-1745 by the Cameldolite monks. Its picturesque location with beautiful lakes and a church on a hill makes the monastery a real tourist attraction, especially after June 1999, when Pope John Paul II stayed here during his pilgrimage to Poland.