For me this was the best part of the whole visit to Rome, cannot recommend this tour enough, NOT for the faint hearted, if your feeling really brave and super fit you can walk the whole 500 steps or like me take the lift to the first platform great views then the last 200 steps have to be walked, steps are tiny and tight and walking around the dome on the inside is a very weird experience and the last few steps are bit scary! However once you reach the top and come out at the top of the dome its well worth it, wow takes your breath away literally, views are amazing and to look down at St Peters square is truly beautiful. We had the perfect views as it was a lovely sunny clear day! We took this tour mid September again get there early as crowds build up and the queues wind their way around St Peters square.