Rome is the clearest example of a city where you are not really buying a tour. You are buying access and sequencing. Nearly everything is standing in the open air where you can look at it for free; what costs money is getting inside the four or five buildings that matter, at a time when they are not full.
Which means the decision on every Rome activity is simple: does a guide add something, or am I paying for a queue? For the Roman Forum, the Vatican and the catacombs, a guide genuinely adds something. For the Pantheon, Trevi Fountain, Spanish Steps and Piazza Navona, walk up and look at them. Any tour charging you forty euros to be shown those four things in sequence is selling you a walk you can do with a phone.
Book in this order
- Borghese Gallery — the hard cap on visitors means this sells out first. Book the moment your dates are fixed.
- Vatican early access — the 7.30am slots go next.
- Colosseum with arena floor — one to two weeks ahead.
- Everything else — a few days out is fine.
The mistake most people make
Trying to do Pompeii as a day trip from Rome. It is three hours each way, so you get a ten to twelve hour day with about ninety minutes at the site. Ostia Antica is forty minutes away, has intact apartment buildings and mosaics, and almost nobody there. Do Ostia, and save Pompeii for a trip that actually stops in Naples.