Columbia subject headings:
Architecture, Renaissance--Italy--Rome.
Architecture--Italy--Rome.
Architecture--Vatican City.
Basilica di San Pietro in Vaticano.
Buildings--Italy--Rome.
Buildings--Vatican City.
Church buildings--Vatican City.
Harvard subject headings:
Architecture, Renaissance--Italy--Rome.
Architecture, Renaissance--Vatican City.
Architecture--Italy--Rome
Architecture--Vatican City.
Basilica di San Pietro in Vaticano.
Buildings--Italy--Rome.
Buildings--Vatican City
Church buildings--Vatican City
Rome (Italy)--Buildings, structures, etc.
Vatican City--Buildings, structures, etc.
Princeton subject headings:
Architecture, Renaissance--Italy--Rome.
Architecture--Italy--Rome.
Architecture--Vatican City.
Basilica di San Pietro in Vaticano.
Church buildings--Vatican City.
Rome (Italy)--Buildings, structures, etc.
Vatican City--Buildings, structures, etc.