The location offers sweeping views across the countryside, though a higher ridge to the east partially obscures the vista. What remains today is a far cry from the structure that appeared on the Down Survey Parish map of Mayne in 1655-6, when it was recorded as ‘a little Castle in repaire at Tulleglasse’ and owned by Peter Shee, noted as an Irish Catholic landowner.

The castle’s footprint now consists of an oval mound measuring approximately 23 metres north to south, with the northwest end spanning 17 metres wide whilst tapering to just 5 metres at the southeast end. Much of the structure was demolished in the mid-1980s, leaving behind a mound completely covered in loose stones and considerably overgrown vegetation. Only two small sections of the original walls survive; a 1.5 metre stretch of roughly coursed, undressed stone wall running north to south in the northwest corner, and another 2 metre section running east to west in the northeast.

These modest remains offer a glimpse into the network of small defensive structures that once dotted the Irish countryside. The Down Survey reference provides valuable historical context, documenting the castle’s existence during the Commonwealth period and its connection to the Shee family, prominent Catholic merchants in the region during the 17th century.