Túr Comharthaíochta an Málainn Bhig, Malin Beg, Co. Donegal

It is a strange thing to find on a remote Donegal headland: part military fortification, part telegraph station, built for a war that never reached this shore.

The tower dates to around 1805, one of more than eighty signal stations raised along Ireland's west, south and north-west coasts by British authorities between 1804 and 1806. The programme followed a decade of invasion scares, most pointedly the French landing at Killala in 1798, and the towers were designed to give early warning of any fleet approaching from the Atlantic. Each worked as part of a chain, using balls and flags hoisted on a mast roughly fifty feet high to send signals from one station to the next, Glen Head to the north, Carrigan's Head to the south-east, and so on down the coastline, each sited on high ground with an unbroken view to its neighbours so that a single message could travel the length of the country within minutes. The Malin Beg tower is recorded as costing £696 to build, with the works in this part of Donegal overseen by Major-General Sir Charles Ross and possibly engineered by Sir William Smith, who is associated with several of the county's other stations. The whole network became obsolete almost as soon as it was finished. After Nelson's victory at Trafalgar in 1805 removed any real prospect of a combined French and Spanish invasion, the towers were stood down by 1809, leaving buildings that had barely seen active use to weather on their exposed headlands ever since.

What survives at Malin Beg is a three-storey rubble-built structure, battered slightly at the base for stability, with roughly squared quoins and traces of the lime roughcast render that once covered it. The window openings are its best feature: cut stone sills and surrounds, with keystone detailing at both ground and first floor level, a level of finish that has been stripped from many other signal towers over the years for reuse elsewhere. Rubble relieving arches sit over some of the openings, and inside there are the remains of fireplaces on two floors, one at ground level flanked by recesses, another above it retaining its cantilevered hearth stone. The parapet that once hid the flat roof is gone along with the roof itself, though fragments of the cantilevered stone walkways that ran along it are still visible. The building occupies a promontory with Malin Bay to the north and Donegal Bay to the south-east, the same commanding sightline that made it useful to a chain of watchers scanning the horizon for ships that, in the end, never came.