Built around 1236 by the knight Thietmar von Oddincrodhe as a monastery chapel, St. Mary's Church in Engerode is of Romanesque origin and is known today not least for its Gothic frescoes in the apse. The murals, which were only uncovered in 1959/60 and may date back to the 15th century, depict scenes from the life of Jesus - the Baptism, the Wedding at Cana, the Temptation and the Passion.
The second smallest and oldest surviving church in Salzgitter became famous as a place of pilgrimage due to a miraculous image of the Virgin Mary - presumably a stone statue - which was moved to Salder Castle in 1744 and has since disappeared. To this day, the Evangelical Lutheran church and its congregation belong to the parish association of the neighboring villages of Gebhardshagen, Calbecht and Engerode, which was founded in 1660.
Further information on the church can be found in the Lower Saxony Monument Atlas
https://denkmalatlas.niedersachsen.de/viewer/metadata/31222183/2/-/