Friends of ours highly recommended using The Roman Guy to do the Colosseum tour because they have access to the underground. I have since found a tour on the Civitatis Rome site that says "Colosseum Tour & Special Gladiator's Entrance." Is that the same as the underground? It says you have access to the Gladiator's Gate.
We're bringing our 11-year-old daughter who LOVES ancient history so would like to give her the best experience.