The parish church of St. Gertrud in Schmallenberg-Oberkirchen has been extended and rebuilt several times over the centuries. The first construction phases can be traced back to the 11th century.
The original Romanesque church with apse and west tower was replaced by a new building. The west wall with round-arched windows from the second construction phase around 1200 has been preserved.
The tower is made of quarry stone with layers of slate; the exact date of construction is unclear. A late Gothic choir was added around 1490. After the destruction of the Thirty Years' War, a Baroque nave was built in the 1660s.
The church's patron saint was changed from St. Michael to St. Gertrude in the 17th century. Construction was completed in the 18th century.
The altars, pulpit and stalls date from this period. The church exemplifies the development of the Baroque style in the region.
Further information can be found at https://www.schmallenberger-sauerland.de/besonderes/dorfkirchen-radroute/st-gertrud-oberkirchen.