Drogheda East Lighthouse, Mornington, Co. Meath

There is nothing decorative about it. Every element, from the riveted supports to the glass panels themselves, was built to do one job in a place where the river meets the Irish Sea and where getting that job wrong had consequences for anyone trying to navigate the channel.

The lighthouse dates from around 1880, a period when the approaches to Drogheda were being made safer through a coordinated scheme of navigational aids rather than a single isolated tower. It belongs to a small family of lighthouses built along this stretch of coast, each positioned to guide vessels through what could be a difficult and shifting channel at the Boyne's mouth. Alongside these lighthouses stood beacons and a lifeboat house, part of the same practical effort to manage the risks of a working river port. What survives at Drogheda East is notable for how much of its original fabric remains intact: the cast-iron lantern, the glazed panel, the supporting legs and the brick walls enclosing the base all appear largely as they were built, rather than as later replacements or restorations. That completeness is what gives the structure its particular value, since it allows the full mechanics of a Victorian-era harbour lighthouse to be read in one place, from the ladder access to the walkway to the light itself.

Seen from the surrounding landscape, the lighthouse's height and its slightly ungainly silhouette, all legs and lantern, place it firmly within a family of similar structures dotted along this coast, each one a small piece of the same nineteenth-century effort to make the Boyne's entrance legible to ships arriving from the sea.