Abbazia di Pomposa (monastery) built
801 CE.
Shown on the map at 44.832°, 12.176°.
Pomposa Abbey is a Benedictine monastery in the comune of Codigoro on the Adriatic coast near Ferrara, Italy. It was one of the most important monasteries in the northern Italy and is famous for the Carolingian manuscripts preserved in its rich library, one of the wealthiest of Carolingian repositories, and for the Romanesque buildings.
Text from the Wikipedia article Pomposa Abbey, licensed CC BY-SA 4.0.