The church of St. Mary Magdalene in Koeru is one of the oldest in the province of Järvamaa, since its origins date back to the middle of the 13th century. It was seriously damaged during the Livonian War in the sixteenth century and during the Great Northern War in the early eighteenth century. At the end of that century, the current church tower was erected.
The high and spacious building consists of a rectangular nave, narrower and smaller chancel ended with a straight wall and a much later tower on the west side. The initial aisleless structure was extended around 1300 to a three-nave hall church.