Before exploring roman history like Forum or Colosseum or Vatican or anything, one must have a quick overview of things. Of course books and private guides are options, but one of the best options is this one.
Beautiful 3 D videos and layer-by-layer description of thousand years of Roman history is just fascinating. My daughters (12 and 10 years old) just loved it. We proceeded to various points like Temples of Portinus, Colosseum, Forum, St Peter, Castle St Angelo, and we didn’t need any guide at any of them. We had all chalked out already from these videos. Besides I am a history buff myself, but reading and seeing things are different.
Whether you know everything, or you know nothing, this experience suits everybody.