Columbia subject headings:
Museo nazionale di Castel Sant'Angelo.
Papacy--History.
Rome (Italy)--History.
Harvard subject headings:
Museo nazionale di Castel Sant'Angelo.
Papacy--History
Rome (Italy)--Buildings, structures, etc.
Rome (Italy)--History
Princeton subject headings:
Museo nazionale di Castel Sant'Angelo.
Papacy--History.
Rome (Italy)--History.