Via dei Fori Imperiali 1
This tourist info point and ticket office sits between the Colosseum and Piazza Venezia.
It avoids queueing to attractive places and also helps a lot in public transportation.
We traveled to the main station in Rome so that we can activate it,
It was not possible in another part of Rome, this is what we were informed from the Metro station. But we had the best experience with it, and we cut the lines and was a good think for our pockets :D