 The structure of the castle was modified and expanded to its slopes and formed a small village, which is also perched.So for a long period of time there was the coexistence of two villages, Calascio and Rocca Calascio, a different strategic functions being the first place on the mountainsides on the road that leads to Santo Stefano di Sessanio and Aquila, and the second in a dominant position on the whole of Navelli plateau and close to the Campo Imperatore pastures.In 1703 it was devastated by a violent earthquake after which the fortress, heavily damaged, was almost completely abandoned and much of the population moved to the underlying Calascio that from now developed more than the fortress.