Duncannon Martello Tower (North), Duncannon, Co. Wexford

Look closely at the shallow, camber-headed window openings and you can still find the date cut into the granite, framed by voussoirs shaped to match the curve of the arch, a small piece of stonemason's confidence surviving two centuries of Atlantic weather.

The tower belongs to a chain of coastal defences thrown up around Ireland's shores in the early nineteenth century, a response to the threat of French invasion during the Napoleonic Wars. Its form, a compact circular plan, tapering walls of honey-toned granite, and a flat parapeted roof platform known as a terreplein, follows a prototype used elsewhere in Ireland, including towers at Bartra in County Dublin and Bray in County Wicklow built only a decade or so earlier. The granite here was laid with tuck pointing, a fine-jointed finish meant to give the impression of more precisely cut stonework than was actually used, and the walls sit on a chamfered plinth of cut granite, details that mark this as a building of real quality rather than a purely functional emplacement. Despite the care taken in its construction, the tower's active military life was brief; it was recorded as dismantled in 1837, only twenty-two years after the keystone was carved, and was later modified to suit other uses.

Today the tower stands in grounds that have been relandscaped, its original roofline no longer visible behind the parapet and its window openings fitted with replacement glazing rather than the originals. The circular battered walls and the coping along the parapet remain legible, though, and the pairing with its sister tower nearby is worth keeping in mind when looking at the composition; the two were conceived and built as a matched set, part of a defensive logic that thought in twos and lines rather than single isolated structures along this stretch of the Wexford coast.