In this third episode we will find Alberto Angela among the spiers of the Milan Cathedral, symbol of the entire city. Passing from the tangle of spiers, pinnacles and statues to the majestic interior with the splendid windows we will take a journey that starts from the end of the 1300s to the present day with a characteristic thread: Candoglia marble, the material with which it was built and which still today it is used for restoration. The journey continues in Abruzzo, where above all it is nature that shows its wonders. Alberto Angela travels through the Gran Sasso and Monti della Laga National Park, where the peak of Corno Grande rises. Finally we will go to Catania, telling the history and beauty of two large and rich buildings.