We highly recommend visiting Volterra. Aside from the Twilight fame, it has many artisans that work with alabaster, which is mined nearby. They create some amazing pieces, including classical sculptures [like marble], chess sets, and plates. We took some photos of the artisans at work:
Here is a quick video:
There was also a touring exhibition of torture devices, which appealed to the kids. http://www.torturamuseum.com/ It was interesting, but resulted in an awkward discussion about genital mutilation that you do not foresee having with your 7 year old.
During WWII the Nazis occupied Volterra and, in order to halt the allied advance, they proposed blowing up the etruscan gate to the city. The citizens protested and, instead, they uprooted the stones that were paving the street and placed them in the arch. This convinced the nazis to spare the arch. It is an amazing example of how stone weathers when it has been left to the elements since 800 BC:
We did not run into the Volturi while we were visiting, but there were some pale goth looking kids wandering about clutching Stephanie Meyer novels.
Ella was enchanted by the head of a wild boar [the local specialty] and thought she would give it a kiss as we excited the city.