Columbia subject headings:
Castles--Conservation and restoration--Germany--Gelsenkirchen.
Castles--Germany--Gelsenkirchen--Guidebooks.
Gelsenkirchen (Germany)--Buildings, structures, etc.
Historic buildings--Conservation and restoration--Germany--Gelsenkirchen.
Schloss Horst.
Harvard subject headings:
Castles--Conservation and restoration--Germany--Gelsenkirchen Region.
Castles--Germany--Gelsenkirchen Region.
Historic buildings--Germany--Gelsenkirchen Region.
Schloss Horst.
Princeton subject headings: