The walls have long since tumbled, the debris spreading northward as if the structure simply leaned and gave way, and today nothing stands above what would have been the original ground floor level. What makes this particular ruin quietly odd is the question of whether it was ever used at all.

The tower was built around 1804 to 1805 as part of a network of over eighty signal stations erected by the British Board of Ordnance along the Irish coastline, a rapid response to the very real fear of a French invasion fleet arriving off the Atlantic shore. The chain ran clockwise from Dublin Bay all the way to Malin Head in County Donegal, with each station relaying messages using a naval signal post, a system of flags and apparatus borrowed from maritime practice. The Bolus Head tower was nearly complete by April 1806, but it may never have been brought into service. About 600 metres to the east sits a separate enclosed barracks and signal station, and it has been suggested that this more substantial installation superseded the tower before it had a chance to function. The abandonment of the entire coastal network followed in any case by the mid-1810s, once the prospect of French landings had receded. A planned station on nearby Hog Island, also known as Scariff Island, appears never to have been built at all. The tower at Bolus Point sits in similarly ambiguous territory, a structure that may have gone from construction site to ruin without a single signal ever being sent. The surrounding landscape adds to the sense of an outpost pushed to its limits: unenclosed blanket bog and rocky cliffs to the west, with the nearest enclosed pasture a kilometre or more away. To the northwest, across roughly eleven and a half kilometres of open water, lies the adjacent station at Bray Head on Valentia Island. Within a couple of kilometres of the tower are older traces of occupation entirely, an early ecclesiastical enclosure at Cill Rialaigh and a coastal promontory fort at Alachaí Mór, a promontory fort being a defensive site where a headland is cut off by a bank and ditch across its landward side.