Columbia subject headings:
Harvard subject headings:
Architecture, Roman--Italy--Rome.
Architecture, Roman--Italy--Tivoli.
Helena, Saint, approximately 255-approximately 330--Tomb.
Italy--Antiquities.
Mausoleums--Italy--Rome.
Mausoleums--Italy--Tivoli.
Tempio della Tosse (Tivoli, Italy)
Princeton subject headings:
Architecture, Roman--Italy--Rome.
Architecture, Roman--Italy--Tivoli.
Helena, Saint, approximately 255-approximately 330--Tomb.
Italy--Antiquities.
Mausoleums--Italy--Rome.
Mausoleums--Italy--Tivoli.