Columbia subject headings:
Architecture--Turkey--Istanbul.
Buildings--Turkey--Istanbul.
Istanbul (Turkey)--Buildings, structures, etc.
Harvard subject headings:
Architecture--Turkey--Istanbul
Mosques--Turkey--Istanbul.
Museums--Turkey--Istanbul.
Palaces--Turkey--Istanbul.
Princeton subject headings:
Architecture--Turkey--Istanbul.
Mosques--Turkey--Istanbul.
Museums--Turkey--Istanbul.
Palaces--Turkey--Istanbul.