Columbia subject headings:
Historic buildings--Austria--Vienna--History.
Hofburg (Vienna, Austria)
Museums--Austria--Vienna--History.
Palaces--Austria--Vienna--History.
Harvard subject headings:
Historic buildings--Austria--Vienna--History.
Hofburg (Vienna, Austria)
Museums--Austria--Vienna--History.
Palaces--Austria--Vienna--History.
Princeton subject headings:
Historic buildings--Austria--Vienna--History.
Hofburg (Vienna, Austria)
Museums--Austria--Vienna--History.
Palaces--Austria--Vienna--History.