OSM tag alt_name=Saardom matches Saardom in these Wikidata fields:
| Church buildings with domes | amenity=place_of_worship, disused:amenity=place_of_worship, man_made=tower, building=church |
| Churches in Saarland | amenity=place_of_worship, disused:amenity=place_of_worship, man_made=tower, building=church |
| Roman Catholic churches in Germany | amenity=place_of_worship, disused:amenity=place_of_worship, man_made=tower, building=church |
| Romanesque Revival church buildings in Germany | amenity=place_of_worship, disused:amenity=place_of_worship, man_made=tower, building=church |