Take a look at a Rome tourist map, and you'll see one area so filled with things to do that it's hard to read the street names.
This is the Centro Storico, the historic center of Rome, with so many art-filled churches, resplendent palaces, and lively squares that you could spend your whole vacation strolling its ancient streets and lanes.
Spend some time just to absorb the neighborhood's atmosphere instead of going from one of its must-see sights to the next. Along with Piazza Navona, the Trevi Fountain, and the Basilica of Santa Maria Maggiore, stop in less well-known churches, such as Santa Maria del Popolo, where you'll find works by Bernini and Caravaggio.
Pause at the Spanish Steps, the flight of irregular stairs and landings that lead up to the French church of Trinità dei Monti. The stairs take their name from Piazza di Spagna, the plaza at their base and one of Rome's most typical squares.