Take the underground and third ring tour at the Colosseum, I cannot stress this enough! Not only are you able to skip the long waiting lines and do you get a guide during the whole experience, but you get the chance to visit the areas which are not open to the general public. Given the chance to stand where the gladiators once stood before they went into battle and perhaps face a certain death, is one you should take. You get a higher point of view from both the inside of the Colosseum but also the surrounding areas including the Forum Novarum.