Along the northeastern slope of this glen, about 300 metres from the river, lie the remnants of what was once a castle at Glen Farm, Glenmorrishmeen. Though the ruins were significant enough to appear on a Scalé map from 1773, preserved in the National Library of Ireland, they’ve since become so overgrown and degraded that they’re no longer visible from ground level.

The castle’s location suggests it was strategically positioned to overlook the Blackwater River valley, a waterway that has long been important for trade and transport in this part of Ireland. The fact that it warranted inclusion on an 18th century map indicates it was still a recognisable landmark at that time, though by then it was already described as ruins rather than an intact structure.

Today, visitors to Glen Farm would find little evidence of the castle without prior knowledge of its location. The site serves as a reminder of how many such structures once dotted the Irish landscape; fortifications that played their part in local history before gradually returning to the earth. The Archaeological Inventory of County Waterford, published in 1999, continues to document these forgotten places, ensuring their stories aren’t entirely lost even when their stones have disappeared from view.