A Roma Pass is a great way to save time and money in Rome, especially during the peak tourism season in late spring, summer, and early fall.
For 36 euros, you can buy a Roma Pass online or in Rome and get free entry to two museums or historical sites, discounts on other entry fees, and free public transport in the city. The Roma Pass is valid for three days (including the date of activation).
The best way to use the Roma Pass is to make sure it pays for itself before it expires. Research the entry fees for the museums and sites the Roma Pass covers, and use your free entries for the two most expensive ones that you want to visit.
For example, if you want to go to the Colosseum and the Galleria Borghese, use the Roma Pass for these two and you will have recouped almost all of the 30 euros you spent on the pass. If you take the metro, a bus, or a tram just once during the rest of your three days, you will have recovered all of the cost of a Roma Pass.
The other best way to use a Roma Pass is to find out which attractions have special entrances for Roma Pass holders and use it for free entry to those attractions. For example, the Roma Pass is very valuable for people visiting the Colosseum, as there is a Roma Pass holders line that is much shorter than the regular ticket line. This can save you an hour or more in the peak season when lines for the Colosseum, the Roman Forum, and other attractions covered by the Roma Pass are long.