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http://www.circusmaximus.us/varianus.html If we assume the width of the modern streets, from building to building, is 10m, then it looks like the length of the superimposed circus varianus in the aerial photo paces out to be ~ 600m...just about the length of the C Max. ...judging by the size of the cars in the photo, that's probably a good estimate. For comparison, the Stadium Domitianum (now Piazza Navona) was https://en.m.wikipedia.org/wiki/Stadium_of_Domitian 275m x 105m, and the Circus Flaminius (3rd cent BC) was 300m. https://books.google.com/books?id=couetXBQO9AC&pg=PA543#v=onepage&q&f=false Another comparison for perspective-- the Piazza Del Popolo, sight of Sienna's famous biennial horse race is about 150m x 250m.