Rome has a terrific underground railway system that will get you near most tourist destinations. The Roman Metro has three lines - A, B and C, plus a new branch of the B line, called B1, which goes from the "Bologna" stop to "Jonio". The combination of A and B lines is X-shaped; the two lines cross at the city's central railway station, which is called Roma Termini. Line C is not yet connected to the rest of the network and has hardly any interest for usual sightseeing. The metro system is efficient and affordable, and metro maps are easy to navigate: beware at rush hours that the trains can get very crowded.

Rome has also an extensive network of trams and buses that will come in handy: it's a big city so trying to see everything by foot is simply not feasible. The whole metro, tram, bus, and part of the train network (comprising the Roma-Lido, Roma-Giardinetti and part of the Roma-Viterbo railways) is managed by ATAC, whose site comes with a handy route planner.

In front of Termini station, there's also an important bus terminus. Don't be confused by all those different Bus Route numbers at stops! Just look at the direction the bus is heading, the arrow on the sign will indicate that, than scan the stops listed. If you are waiting for a specific numbered bus, but another route has a stop you recognize as close to your destination, jump on! One of the great things about being daring, and possibly getting lost, is that you cannot get That Lost, and second, you never know what you will find just wandering around. Explore!

Rome's mini electric-bus routes are particularly helpful for visitors going to many of the popular tourist sights. Note that there are differences in routes for weekends and evenings.  Map of the mini electric-bus routes here.

An individual ticket for bus, metro, tram and trains inside the municipality of Rome is 1.50 € and is valid for 100 minutes. If you will be in Rome for an extended period of time, one can buy a seven day Metro and bus pass (called CIS) for 24 €. For shorter stays, one can get a 24 hours pass for 7 €, a 48 hours pass for 12.50 €, or a 72 hours pass for 18 €. However, especially when one stays in a fairly central area and if one likes to walk, buying 2-3 individual tickets a day may be the best bargain. There is a new eRoma pass which costs €35 for a calendar month plus a one-time charge of €10 for the reusable card (you may buy this card at metro or local-train ticket offices, photo ID is required). Children less than 10 years old can travel on any bus, tram or metro for free if they are accompanied by an adult person with a valid ticket. Tickets and Passes fares are here.

The 'Roma Pass' is another option; it costs € 36.00 and gives you 3 days of free bus and Metro travel plus free and discounted museum/monument admissions. Alternatively, there is also a 'Roma Pass 48 hours' for € 28.00. These passes are rather expensive, so they are recommendable just if one wants to visit lots of the concerned museums.

Taxis are usually not to recommend to cross the city of Rome, especially if one can easily use a bus or a metro for the same route. Taxis are certainly much more expensive, not so fast because of traffic jams, and using taxi when it is not indispensable contributes to increase traffic and pollution, two not secondary issues in Rome. However, a taxi may be useful for very long routes (from/to the outskirts of Rome, or from/to the airports). About taxi, see the specific page