Might be a good idea to keep Roman Coliseums. While they add to culture penalty, being able to hold games can be very, very useful to control those bloodthirsty Roman citizens

Also...the Brutii Temple of Juno is superior in Law&Order qualities to anything Carthage gets, so depending on what level you find it, you might want to consider keeping it. The Temple of Mars isn't too shabby either with its experience bonuses...