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Rocca Calascio is a mountaintop fortress or rocca in the Province of L’Aquila in Abruzzo, Italy. Built of stone and masonry exclusively for military purposes and intended only to accommodate troops and never as residence for nobles, the fortress overlooks the Plain of Navelli at one of the highest points in the ancient Barony of Carapelle. Santa Maria della Pietà and Rocca Calascio. Construction of the fortress started in the tenth century as a single watchtower. A walled courtyard with four cylindrical towers at the corners around a taller inner tower was added in the thirteenth century. The lower half of the fortress is built with distinctively larger stones than its upper half. It is believed that this feature was to make its base impenetrable to invaders. The fortress was never tested in battle. However, it was badly damaged in November 1461 by an earthquake with an estimated magnitude of 7 to 8 on the Richter Scale. wikipedia
coordinates: 42.328889, 13.688944
photogrammetry from youtube video
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