It is not a defensive structure in any meaningful sense, nor a working building. It is a belvedere, the term borrowed from Italian meaning literally "beautiful view", a category of ornamental architecture built purely to give its occupants somewhere elevated and agreeable to sit and contemplate a prospect. This one is two storeys tall, modest in its footprint at roughly three metres across internally, and distinguished by a large round-headed window on the first floor of its southern wall, positioned precisely to frame the view it was built to celebrate.

The tower sits within the designed landscape of the Townshend family estate at Castletownsend, a small coastal village in West Cork whose history has long been shaped by that same family. Demesne landscapes of this kind, in which landowners arranged gardens, woodland, water features, and eye-catching structures across their grounds to create composed views from the house and agreeable destinations for walks, were a fashionable pursuit among the Anglo-Irish gentry from the eighteenth century onwards. A belvedere served a particular role in this scheme: positioned at a distance from the main house, often on higher or more dramatic ground, it offered a secondary vantage point and gave the landscape a focal incident when viewed from below. The harbour setting here would have made the effect especially deliberate, with the tower both overlooking the water and visible against the slope from boats and the village beyond.