For information on the Vatican, check out www.vatican.va.
In Italy not only contains solid information on Italy and Rome presented in a very personal and friendly way, but it also has one of the best sets of links to other Italy-related sites on the Web.
Another helpful site is www.rome.info.
Information, Internet, maps, and the Roma Pass are available at “Tourist Information Points” maintained by Roma Capitale at various sites around the city. They’re staffed daily from 9:30am to 7pm, except the one at Termini (daily 8am–7:30pm), located in “Centro Diagnostico” hall (Building F) next to platform 24; there’s often a long line at this one, so if you’re staying near others listed here, skip Termini: Lungotevere Vaticano (Piazza Pia) near the Castel Sant’Angelo; Via Nazionale 183, near the Palazzo delle Esposizioni; on Piazza delle Cinque Lune, near Piazza Navona; on Via dei Fori Imperiali (for the Forum); at Via Santa Maria del Pianto 1, in the old Ghetto district; and on Via Marco Minghetti, near Via del Corso. All phone calls for Roma Capitale are directed through a centralized number: [tel] 06-060608. Call daily between 9am and 9pm.
Local travel agency Enjoy Rome, Via Marghera 8a, 3 blocks north of Termini ([tel] 06-4451843), is also helpful, dispensing information and finding hotel rooms, with no service charge (in anything from a hostel to a three-star hotel). Hours are Monday to Friday 9am to 5:30pm, and Saturday 8:30am to 2pm.
If you plan to do serious sightseeing in Rome (and why else would you be here?), the Roma Pass is definitely worth considering. For 38,50€ per card, valid for 3 days, you get free entry to the first 2 museums or archaeological sites you visit; free admission to Museo della Repubblica Romana, Museo Bilotti, Museo Canonica, Museo delle Mura, Museo Napoleonico, and Villa di Massenzio; discounted entry to all other museums and sites; free use of the city’s public transport network (bus, Metro, and railway lines; airport transfers not included); express entry to the Colosseum; a free map; and free access to a special smartphone app. There’s also a 48-hour version for 28€ that grants free entry to the first museum or archaeological site you visit, plus the same benefits as the 3-day version for 2 days. Note also that the Vatican Museums are not part of either pass plan. Buy the passes online and pick them up at one of the Tourist Information Points.
An alternative is the Archaeologia Card, which for 25€ gives free admission to 9 sites for up to 7 days: the Colosseum, Palatine Museum and Roman Forum, Palazzo Massimo alle Terme, Palazzo Altemps, Crypta Balbi, Baths of Diocletian, Cecilia Metella, Villa dei Quintili, and Baths of Caracalla. The cards are sold at any of the monuments' ticket booths. Here transport is not included, so if you plan to do a lot of sightseeing, the Roma Pass is much better value.
Finally, if you are a return visitor or have an interest in Rome’s well-stocked niche archaeological museums, the Museo Nazionale Romano combo ticket is the one to buy, as it covers entry to the Palazzo Massimo alle Terme, Palazzo Altemps, Crypta Balbi, and Baths of Diocletian for just 7€ (plus 3€ when special exhibitions are on). You can buy online at www.coopculture.it, but it’s just as easy to buy in the first museum of the four you enter. It is valid for 3 days.