Columbia subject headings:
Warsaw (Poland)--Buildings, structures, etc.--History.
Zamek Królewski (Warsaw, Poland)--History.
Harvard subject headings:
Warsaw (Poland)--Buildings, structures, etc.
Zamek Królewski (Warsaw, Poland)--History.
Princeton subject headings:
Castles--Poland--Warsaw.
Warsaw (Poland)--Buildings, structures, etc.
Zamek Królewski (Warsaw, Poland)