Columbia subject headings:
Italy--Antiquities.
Rome (Italy)--Antiquities.
Underground areas--Italy--Rome.
Harvard subject headings:
Rome (Italy)--Antiquities.
Underground areas--Italy--Rome.
Princeton subject headings:
Historic buildings--Italy--Rome.
Historic sites--Italy--Rome.
Rome (Italy)--Antiquities.
Rome (Italy)--Description and travel.
Rome (Italy)--Pictorial works.
Underground areas--Italy--Rome.