Rome wasn't built in a day, so you shouldn't expect to see it in one either. But if that’s all the time you have, you can get a taste that will whet your appetite for a future, more leisurely trip. If you’re a first-time visitor, the Vatican and the remains of ancient Rome are must-sees. Both require at least half a day; a good strategy is to devote your first morning to one and your second to the other. Save time by purchasing “skip the line” passes, available for St. Peter’s, the Vatican Museums, and the Colosseum. These cost €24.90, €27.50, and €19,90, respectively, if purchased from street booths, and less if you buy online. Leave the afternoons for exploring the neighborhoods that comprise Baroque Rome and the shopping district around the Spanish Steps and Via Condotti. Among the sights, Galleria Borghese and the church of San Clemente are particularly worthwhile, and Trastevere and the Ghetto make for great roaming.