Moyvannan Castle, Moyvannan, Co. Roscommon

Most either crumble quietly into ivy or get frozen as monuments behind a fence. Moyvannan did neither. It grew. Walk around it and the join is visible: a squat, three-stage sixteenth-century tower standing shoulder to shoulder with a taller, more genteel nineteenth-century block, the two knitted together under one continuous crenellated parapet, so that from a distance the whole composition reads as a single castellated country house rather than an old fortification with a Victorian afterthought bolted on.

The tower house itself dates from the sixteenth century, built in the defensive tradition of the period, a tall, narrow structure with thick walls designed for security rather than comfort. Around 1860 it was absorbed into a new three-bay, two-storey house, rendered and finished with a tooled limestone string course, its windows given chamfered limestone surrounds and its main door a Tudor-arched opening with a label moulding, a projecting drip-course above the door meant originally to throw off rainwater but by this date more decorative than functional. The tower's own openings were left more varied, a record of centuries of alteration in a way the newer wing was not. Somewhere in between these two building phases, the structure also served as a church, before eventually settling into domestic use again. The crenellations along both roofs, the so-called Irish crenellations of stepped battlement pattern, are the detail that ties the whole history together visually, echoing the fortified silhouette of the tower even where the newer house has no defensive purpose at all. It is a rare instance of a building's later owners choosing to extend a castle's language rather than erase it, so that the additions read as continuation rather than contradiction.

Today the building serves as guest accommodation under its current owners, Elan, which means the tower house that once might have sheltered a family under threat, and later held a congregation, now houses visitors for considerably gentler reasons. The roofline is worth studying from ground level if access allows, since the slate and terracotta ridge tiles of the nineteenth-century section sit only a few feet from the roughcast render of the older tower, a small stretch of roofline carrying three centuries of use within it.