This Butler stronghold has a turbulent history stretching back to at least the 16th century, when David fitz Walter Butler held the castle and received a pardon in 1576 for a fine of 20 shillings. The Butlers maintained their grip on Currahill through the generations, with Richard Butler dying here in 1612 and Walter Butler holding it during the 1641 rebellion. However, their fortunes changed dramatically under Cromwell’s rule; the estate was forfeited in David Butler’s name sometime before 1653. By 1677, Harvey Morres had received a grant for the castle, town and lands, promptly evicting the Butlers and settling into what was likely the tower house itself, for which he paid six shillings hearth-money in 1664.

The tower house itself is an impressive structure measuring roughly 10.5 by 9 metres at its base and rising to 17 metres in height, though its original roof and parapets have long since vanished. Built from roughly coursed rubble with a pronounced base batter that extends 3.6 metres up the walls, the building demonstrates sophisticated medieval defensive architecture. Entry is through a pointed doorway on the northwest wall, which leads to an entrance lobby protected by a murder hole above; a feature that would have allowed defenders to attack intruders from the floor above. The ground and second floors retain their barrel vaulted ceilings, the former showing evidence of wicker centring used during construction. A mural staircase beginning in the northwest wall provides access between floors, transitioning to a spiral configuration in the eastern angle at second floor level.

Each floor reveals the careful balance between defence and domestic comfort typical of Irish tower houses. The ground floor, lit by three arrow loops within hourglass embrasures, was primarily defensive. The first floor, accessed via the mural stair, featured more comfortable appointments including an ogee-headed window, a large fireplace in the southwest wall, and a garderobe chamber complete with a wall cupboard. The second floor, originally supported by wooden beams on corbels, contained an L-shaped mural chamber and separate garderobe facilities, whilst the third floor, now largely ruined with significant breaches in multiple walls, once housed a large chamber and included the chilling addition of an oubliette; a pit prison accessed through an opening in the northwest wall. External evidence of machicolations, defensive structures that allowed defenders to drop objects on attackers below, can still be seen in the form of a surviving corbel support on the southeast wall.