The Renaissance center in the Tiber High Valley is a historical place in Umbria .
The region is characterized by hills , mountains , valleys and historical towns such as Perugia ( known as an important university centre ) , Assisi ( a World Heritage Site associated with St. Francis of Assisi , the Basilica of San Francesco and other Franciscan sites , works by Giotto and Cimabue ) , Terni ( the hometown of St. Valentine ) , Norcia ( the hometown of St. Benedict ) , Città di Castello , Renaissance center of the Tiber High Valley , Gubbio ( the hometown of St. Ubald and of Federico da Montefeltro ) , Spoleto , Orvieto , Castiglione del Lago , Narni , Amelia , and other small cities .
Umbria