For Vatican this is excellent value https://www.viator.com/en-GB/tours/Rome/The-Key-Masters-Tour-Opening-the-Sistine-Chapel/d511-15693P215 https://www.viator.co

For Vatican this is excellent value https://www.viator.com/en-GB/tours/Rome/The-Key-Masters-Tour-Opening-the-Sistine-Chapel/d511-15693P215 https://www.viator.com/en-GB/tours/Rome/The-Key-Masters-Tour... The fancier option would be this https://www.viator.com/en-GB/tours/Rome/Private-Vatican-VIP-Experience-Vatican-Museums-and-Sistine-Chapel-Including-Hotel-Pickup/d511-20163P29 https://www.viator.com/en-GB/tours/Rome/Private-Vatican-VIP-... This Colosseum tour is very good too https://www.viator.com/en-GB/tours/Rome/Exclusive-visit-of-the-Colosseum-Undergrounds-private-tour/d511-127433P122 https://www.viator.com/en-GB/tours/Rome/Exclusive-visit-of-t... Viator is not a terrible place to book, but there are many alternatives. A good travel agent or hotel concierge can deal with this for you, and also advise you about guides. Context Travel consistently offers a quite high level of guides, with a more in-depth educational focus https://www.contexttravel.com/cities/rome https://www.contexttravel.com/cities/rome You can go very deep into this, for places like the Colosseum or Vatican you can find hundreds of guides with very different focuses.