Columbia subject headings:
Architecture, Medieval--Italy--Padua.
Castles--Italy--Padua.
Fortification--Italy--Padua--History.
Padua (Italy)--History, Military.
Padua (Italy)--History.
Harvard subject headings:
Princeton subject headings:
Castello di Padova (Padua, Italy)
Padua (Italy)--Buildings, structures, etc.