drive down to Trevi. This we did via Cortona / Perugia (outskirts only !) / Spello / Foligno (again, only outskirts) / Trevi. As we passed Assisi we said "No point going *there* -- not on a Sunday morning !"; and we didn't go any other time, because it was always completely shrouded in smog !

As we passed Spello we turned off for a quick peek and took a nice pic. in the morning sun; but although we then drove in for a bit of an explore, we found that *that*'s where all the people were, not in Assisi !, and NOWHERE TO PARK !!!
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Amongst the *many* sites dedicated to castles in Toscana is this one, to castles in the Arezzo area. It may interest you to check someone else's views of some of those we visited.
Click on the camera:  images gallery -
Arezzo.