The Tholsel, West Gate, Carrick-on-Suir, Co. Tipperary

The clock and its octagonal lantern, added around 1750, sit atop a four-storey towerhouse raised close to the year 1500, and the join between the two periods is written plainly into the walls if you know where to look. It is the kind of structure that has clearly been altered every century or so to suit whatever the town needed of it, yet it has never stopped anchoring the streetscape around it.

The building's original purpose is bound up in its name: a tholsel was a combined toll house and meeting place, where market dues were collected and civic business conducted, and towns across Ireland built or adapted such structures as symbols of local authority as much as practical necessity. Here the towerhouse form, thick walled and defensively minded, with battered corners at the south-east and south-west to deflect blows or simply to spread the load of the masonry, was pressed into that civic service. Inside, the building keeps two features that speak to very different anxieties: a murder hole, a defensive opening set above an entrance through which objects or missiles could be dropped on anyone trying to force their way in, and a set of seventeenth-century fireplaces that point to a later phase when comfort mattered as much as security. The pointed arch entrance on the south elevation, now fitted with a replacement timber door, and a round-headed recess added in a later remodelling, are further evidence of a building that has been continually adjusted rather than preserved in amber. The eighteenth-century additions, the clock drum with its three faces, the moulded cornice, the copper-roofed lantern with its weather-vane finial and louvred fittings, gave the old towerhouse a new civic role as timekeeper for the town, its painted rendered sandstone walls making it as much a landmark for the eye as for the ear.

The tower stands on a narrow one-way street, which shapes how it is approached and photographed; there is no broad plaza here to step back into, so the building tends to loom rather than announce itself from a distance. The clock faces, visible from three sides, are the easiest way to orient yourself toward it if you are arriving without knowing quite where to look, and the battered base is worth crouching to examine once you are close, since it is the clearest surviving clue to the fifteenth-century structure hidden beneath the eighteenth-century clockwork above.