I highly recommend you see the amazing ancient treasures of Rome, but use a reputable company such as Walks of Italy. The guides are well educated and will point out to you interesting facts. Also, being on a guided tour means an air conditioned van to get you around and less time spent figuring out how to get from point A to point B. The ancient gems I saw with WoI included the Palentine and Aventine Hills, chariot race track, Knights of Malta, Jewish ghetto, and much more.