is a mountaintop fortress
in the Province of L'Aquila
At an elevation of 1,460 metres (4,790 ft), Rocca Calascio
is the highest fortress in the Apennines
. 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.