Where other cultures did not give much place to secular monuments other than tombs and temples, Romans took this to another level and furnished their cities with theaters and baths. These places were for people to socalize. The Romans inserted free standing monuments using arches and concrete vaults where the Greeks went with the flow and inserted their theathers according to the topography.
Rome’s Circus Maximus contained nearly 150,000 viewers in order to host the chariot races which the arena was in a U shape, long and narrow.
As for the other battles such as gladiatorial contests the Romans came up with a brand new theater, amphitheater, with forming an ellipse by joining two theaters with gigantic stone and concrete shells. Such example was greatly significant in the Colesseum in Rome which had Tuscan order at the base and above was the Ionic order followed by the Corinthian order.
Thermae, Roman baths, which covered a great deal in the urban territory used under floor heating, hypocaust, with hot air by furnaces beneath the pavements.This was an adventageous system comparing with previous systems using charcoal which smoked and smelled..