Columbia subject headings:
Palaces--Portugal.
Palácio Nacional da Pena (Portugal)
Harvard subject headings:
Decoration and ornament--Portugal--Sintra Region.
Eclecticism in architecture--Portugal--Sintra Region.
Palaces--Portugal
Palácio Nacional da Pena (Portugal)
Palácio Nacional da Pena (Portugal)--Guidebooks.
Palácio Nacional da Pena (Portugal)--History.
Princeton subject headings:
Palaces--Portugal.
Palácio Nacional da Pena (Portugal)