Stack Rock Fort

Island fort, in two parts, a gun-tower of 1850 in tooled grey limestone of two storeys, to trefoil plan with rounded elevations, coped parapet and flat roof, completely surrounded by an added ring in rock-faced limestone and silver granite, comprising a casemates for guns in the main part occupying three-quarters of the circle and a recessed two-storey block on N side, to same roof line. From the exterior the inner tower is not visible. The casemates comprise sixteen large deeply-recessed cambered-headed openings with iron shutters, the recesses square-headed. Masonry in large square blocks with raised coping, high base of smaller rock faced blocks sloped outward in lower half, with bull-nose string-course below casemates, and flat roof with concrete gun emplacements. The ends of the casemate ring are rounded and return in to the 2-storey N range which has a curved 3-bay front with widely spaced small square windows and centre square-headed door, raised above high battered plinth.

Interior not accessible, the rear of the two-storey N range has brick walls with broad cambered-headed openings, glazed in small panes with mullions and transom. The upper floor is accessed by an iron balcony.