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You can walk or cycle on top of the ancient city walls. The entire perimeter is approximately 4 km. This gives a good introduction to the city layout. Expect crowds in the summer months.
A former Roman amphitheatre, but the remains of the amphitheatre are gone. The houses there are of medieval origin, built where the spectator stands were.
Romanesque cathedral dating to 14th century. Contains the must-see Volto Santo and Ilaria del Carretto's Sarcophagus by Jacopo della Quercia (as of May 2014 you have to pay an additional €4 to see this). Includes a sculpture of the crucifixion attributed to an eyewitness, Nicodemus. Some interesting carvings in the marble exterior, including a labyrinth.
This is a tower with trees atop it, a very dramatic sight, with good views of the city. No lift, many stairs.
Ancient clock tower with original clock still working. It is possible to go upstairs in this tower for a beautiful view of the city and a good perspective of Fillungo street. Great views of Torre Guinigi's trees. No lift.
This was Puccini's birthplace and is now a museum about the composer.