The structure appears on earlier cartographic evidence too; the Down Survey maps from 1655-6 clearly show a castle at this location, complete with a bawn, that defensive walled courtyard so characteristic of Irish fortified houses from the period.

By 1640, the castle and its bawn belonged to John Power, Lord Curraghmore, whose family seat still stands nearby as one of Ireland's most impressive estates. Local accounts from the early 20th century suggest the castle may have occupied a high bank near what would later become the railway station, though this raised ground has long since been levelled. The exact nature of the castle's demise remains unclear, but by the time the Ordnance Survey cartographers arrived in the 1840s, only its memory remained worthy of notation.

Despite the tantalising historical references, modern archaeological investigations have drawn a blank. Two separate testing programmes conducted in 2003 failed to produce any material evidence connected to the castle, leaving its precise location and physical characteristics largely to the imagination. What remains certain is that this corner of Kilmacthomas once held a defensive structure significant enough to merit inclusion on multiple historical maps, even after its stones had vanished from the landscape.