Meet 15 minutes before the start of the tour at the arch of Constantine. There will be a representative holding an ItaliaTours sign to greet you. An official form of ID will be required to enter the Colosseum.
The start time advertised is the start time for your guided Colosseum tour. Your visit to the Mamertine Prison will occur earlier in the day (approx. 1:30 PM, we'll send you a confirmation PDF voucher in advance of the tour).
Your tour concludes beside the Roman Forum.