- all the medieval buildings facing Piazza del Comune (Cathedral, Baptistery, Torrazzo Tower, City Hall, Soldiers' Loggia),
- the inside of the Cathedral (cycle of frescoes dating back to the early 16th Century and recent findings),
- the inside of the Palazzo Comunale (City Hall) with the Collection of Ancient Instruments made by Andrea Amati, Antonio Stradivari and Giuseppe Guarneri del Gesω (entrance fee: 3,50 / person). It is usually possible to book and enjoy a short performance of one of the ancient violins (added fee: 1,50 / person, working days only, pre-booking a must),
- the inside of the Baptistery with the original dome and the Collection of Pietre Romaniche (romanesque sculptures) of the Cathedral (entrance fee: 1,00 / person).