One the two Ballysaggartmore Towers in Co Waterford. They are regarded as follies built no later than 1834. From the Wikipedia page:
“They were constructed for an Anglo Irish Landlord, Arthur Keily-Ussher no later than 1834. He held an estate of approximately 8000 acres, the majority of which was rented to tenant farmers but he retained approximately 1000 acres as a personal demesne. The lodges were constructed on the main avenue leading to the family’s residence; Ballysaggartmore House. The house itself was large but of a very plain design, which was in obvious contrast to the lodges. An account from 1834 indicates that a main house predated the lodges. This account also reports that they were built from designs by the head gardener; John Smyth and that the main entrance gates were forged locally for the sum of about £150.”
I took quick photos of the other Tower but we were drenched by a sudden cloud burst of rain so we were pretty miserable and just wanted to get back to the car.