The best way to discover the elegant historic centre is to walk it. Enter by Porta al Prato, in the lower part of the town, and walk uphill until you reach the summit and Piazza Grande, which hosts a great many cultural events of international significance. You will meet Renaissance palazzo after Renaissance palazzo, a slew of artisan workshops and beautifully façaded churches that are even more astonishing and interesting inside.
You must also see the wonderful tower and gothic-style façade of the Palazzo Comunale. Opposite this, the town hall, stands the Cathedral, which dates back to the sixteenth century.
Immediately below the circuit of walls you can admire the Temple to the Madonna di San Biagio, the work of Renaissance artist Antonio da Sangallo the elder. This church is considered an architectural triumph, so much so that Michelangelo cribbed from it when he was sketching the first drafts of what would become St Peter's Basilica in Rome.