At the end of the war the castle was seized by American soldiers, from 1946 it was rented by the Archdiocese of Bamberg under Jupp Schneider and sold in 1949.
During the war it was disguised as a hospital and had tiles in the form of a red cross on the roof, but actually housed a laboratory for secret Nazi armament projects.
Nevertheless, in 2011 a document came into the hands of cryptographer-historian, Norbert Ryska, from the American special unit, Ticom (Target Intelligence Committee), which described the work of Vierling at Feuerstein Castle in more detail.
The castle has been expanded by dormitory accommodation, a dining hall, leisure facilities (Kegelbahn, table tennis, volleyball, hard court, sports field), conference rooms, camping sites, agriculture, a riding stable and a glider airfield.
After leaving the lower church, the path runs past windows that portray the fundamental attitudes of Christian spirituality: Oratio – Meditatio – Contemplatio ("prayer - meditation - contemplation").
It was consecrated in 1961 and constructionally anticipated the liturgical reform of the Second Vatican Council a year later: the altar is positioned in the nave so that the priest can celebrate mass with the congregation.