Churches
Catholic churches in Białystok (with the imposing modern 
St. Roch's and the 17th century church with its neo-gothic addition the cathedral), Łomża (with the gothic 
St. Michael Archangel's Cathedral or 
St. John the Baptist's Cathedral founded by princess Ann Mazovian in 1504-1525), churches in Tykocin, Bielsk Podlaski, Siemiatycze, Choroszcz.
Orthodox churches: the cathedrals in Białystok, Bielsk Podlaski, The Holy Trinity church in Hajnówka or the church at the 
Holy Grabarka Mountain restored after the fire (the pilgrimage centre of the Polish Orthodox community).