Our tour groups are never larger than 25 people, and even then we provide audio headsets to make sure you don't miss a word. Moreover, the reservation and transaction fees are already included in the price, so no unpleasant surprises are waiting for you at the checkout.
The underground area of the Colosseum & the 3rd tier hold outstanding stories & sights of the Ancient world. They are specifically open on specific hours on particular days of the month.