Columbia subject headings:
Architecture--Expertising--Italy--Reggio Emilia.
City planning--Italy--Reggio Emilia--History.
Reggio Emilia (Italy)--Buildings, structures, etc.
Harvard subject headings:
Princeton subject headings:
City walls--Italy--Reggio Emilia.
Gates--Italy--Reggio Emila.
Porta Castello (Reggio Emilia, Italy)
Reggio Emilia (Italy)--Buildings, structures, etc.