A large, usually oblong or oval, roofless place, surrounded by tiers of seats rising one above another, for chariot races, public games, etc. People from upper and lower classes could attend. When do games were being held, musicians like flute players would perform. Sometimes even plays were performed.

Is this better for Roman circus?

Oh an the last line is supposed to say "There were surprisingly no animals in the original Roman circus. Those may have same from Greece influences."