Columbia subject headings:
Castles--Germany--Ratingen.
Mansions--Germany--Ratingen.
Ratingen (Germany)--Buildings, structures, etc.
Schloss Landsberg (Ratingen, Germany)
Thyssen, August, 1842-1926--Homes and haunts.
Harvard subject headings:
Castles--Germany--Ratingen.
Mansions--Germany--Ratingen.
Schloss Landsberg.
Theis family--Homes and haunts.
Princeton subject headings: