The Church of Our Lady of the Rosary was built in 1878 in one of Olsztyn’s nearby villages Dajtki, which is now one of the districts of the city. It is an interesting fact that it was built as a chapel of the Rosary on the pilgrimage route leading from Olsztyn to Gietrzwałd where, in 1877, a revelation of the Mother of Jesus occurred.

The sanctuary was built from the characteristic red brick, giving its architecture features of a Neo-Gothic style. In 1904 the side chapels were added, and in 1950 it was enlarged by the vestry and chancel. The construction was generally renovated in 2005-2006.

A characteristic feature of the church is a two-storey tower with a brick frieze, which is the only external decoration of the block. The church’s main entrance is located in the tower. The sanctuary’s interior is a concourse with one nave, which is separated from a chancel by an arch. The nave is crowned with a barrel vault. The main elements of the interior are three altars and bas-reliefs found in the side chapels.