Start at the Piazza del Popolo, the traffic-free, travertine-paved main square. This beautifully proportioned outdoor meeting place must be one of the most elegant provincial squares in all Italy. To one side of the square stands the Palazzo del Popolo, a splendid 13thC building guarded over by a monumental statue of Pope Paul III. Look inside to see the arcaded Renaissance courtyard.
Closing off one end of the piazza is the great Gothic church of San Francesco, a sober but pleasing building both inside and out.
The other main square, Piazza Arringo, is almost as impressive as its big sister and is flanked by the Duomo, or cathedral, and the town hall, or palazzo Comunale.