First marked on the 1837 Ordnance Survey six-inch map with gothic lettering befitting its supposed status, this structure measured roughly 15 metres northwest to southeast and 10 metres northeast to southwest. By the 1914 edition, cartographers had downgraded it to merely “the site of a castle”, suggesting that whatever stood here had already vanished or fallen into considerable ruin.

Today, visitors to Roxborough will find a grass-covered stony platform, somewhat smaller than the original mapping suggested at 10.8 by 8.5 metres, rising just 30 to 50 centimetres above the surrounding landscape. The modest elevation on which it sits would have offered little defensive advantage, and no historical records have surfaced to explain who built this structure, when it was constructed, or what purpose it actually served. The “castle” designation on early maps may have been optimistic; it could equally have been a fortified house, a tower house foundation, or even an agricultural building that local tradition elevated to grander status.

Adjacent to the southwest lies a substantial quarry, stretching approximately 50 metres and reaching depths of up to 1.8 metres, which may have provided building stone for the mysterious structure or perhaps was excavated long after the building’s abandonment. Without archaeological excavation or documentary evidence, this enigmatic platform remains one of Ireland’s many minor historical puzzles; a reminder that not every site marked on old maps comes with a neat explanation or dramatic backstory.