Todi is a town and comune (municipality) of the province of Perugia (region of Umbria) in central Italy. It is perched on a tall two-crested hill overlooking the east bank of the river Tiber, commanding distant views in every direction.In the 1990s, Richard S. Levine, a professor of architecture at the University of Kentucky, chose Todi as the model sustainable city, because of its scale and its ability to reinvent itself over time.