One of the oldest surviving churches in Eastern Europe, the Kolozhskaya Church (Church of Saints Boris and Gleb) stands dramatically on a steep bank of the Neman River in Grodno. Nearly nine centuries old, this architectural gem is unique for its decorative walls inlaid with colored stones and ceramic vessels — over 400 clay pots (golossniki) were embedded into the masonry to serve both acoustic and structural purposes.

Built in the 12th century during the era of the Grodno principality, the church has survived wars, floods, and partial collapse of its riverside wall. Despite losing a section to the river, the remaining structure preserves authentic 12th-century masonry techniques found nowhere else. The church is a candidate for UNESCO World Heritage status.

The distinctive polychrome walls with inlaid colored stones and ceramic vessels visible as small round openings. The contrast between the original left wall (where builders' fingerprints are still visible in the ancient mortar) and the modernized right side. The riverside setting offers stunning views of the Neman valley. Inside, traces of original frescoes survive on the walls. Services are held regularly — visitors are welcome to join. The church is part of a walking route that connects to Grodno's Old Castle nearby.