The Romanesque Peterskirche (Peter's church) is situated on a hill, about one kilometer north of downtown Oberstenfeld. Built in the mid 11th century, it is a relict of a lost precursor commune. The choir was arched over and the church's inside was painted with frescos in the 13th century. Some of those frescos are still present today. The church was nearly forgotten and unused for a long time. However, it is used for protestant and occasionally also for Roman Catholic services since it was restored between 1973 and 1976.