Columbia subject headings:
Amphitheaters--Rome.
Circus--Rome.
Games--Rome--Buildings.
Stadiums--Rome.
Harvard subject headings:
Amphitheaters--Rome.
Circus--Rome.
Games--Greece--Buildings.
Stadiums--Rome.
Princeton subject headings:
Amphitheaters--Rome.
Circus--Rome.
Games--Rome.
Stadiums--Rome.