Aretine
What Arezzo needs is a little more homage to Petrarch and a little less homage to Vasari. At least no-one let him loose on the Pieve de S. Maria.

But after a day there, I can see Piero della Francesca frescoes when I close my eyes, the way you see the little figures in a computer game for hours after playing it.

Frescoes are vastly preferable. And let's not forget the ceiling of the Duomo, not in any guidebook, with the creation of the world and the wrestling Jacob by Guillaume de Marcillat.