Incredible Fortress: "Rocca Calascio". National Park of "Gran Sasso". Italy

Rocca Calascio: This Fortress is the highest mountaintop fort in Italy (1460m above sea level).
Was initially built as a watchtower in the 10th century. Situated on Abruzzo region. Aquila province. Calascio village. National Park of "Gran Sasso e Monti della Laga"