Columbia subject headings:
Architecture--France--Paris--History--19th century.
Architecture--France--Paris.
Palaces--France--Paris.
Paris (France)--Buildings, structures, etc.
Harvard subject headings:
Art nouveau (Architecture)--France--Paris.
Mansions--France--Paris.
Paris (France)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Domestic--France--Paris.
Architecture, Modern--19th century--France--Paris.
Palaces--France--Paris.
Paris (France)--Buildings, structures, etc.