Kalozha Church
Horadnia Region, Belarus
The Kalozha Church of Sts. Boris and Gleb is the oldest extant structure in Grodno, Belarus. It is the only surviving monument of ancient Black Ruthenian architecture, distinguished from other Orthodox churches by prolific use of polychrome faceted stones of blue, green or red tint which could be arranged to form crosses or other figures on the wall.
Church data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).