What lies in a south-facing slope at Foulkstown is a barrow, a prehistoric burial monument, that has been quietly swallowed by the working landscape around it. Roughly circular and built from gravelly clay, it measures approximately 21 metres north to south and 18 metres east to west. A scarp, essentially a stepped or sloped edge in the ground, defines its perimeter, ranging in height from around 46 centimetres to 88 centimetres. The interior rises gently towards the centre, gaining about 34 centimetres over four metres, which gives a faint but noticeable dome to anyone who walks across it.

What makes the site quietly odd is how thoroughly the later landscape has absorbed it. The western quadrant of the mound has been folded into a field boundary, with a hedgerow planted along it and conifers growing above. A ditch associated with that same boundary runs along the outer edge. In other words, a farmer at some point recognised the mound's curved profile and simply used it as convenient ground for a boundary, bending the field margin to follow the monument's arc. The mound sits under pasture and is not immediately legible as an ancient structure unless you know what to look for. Just four metres to the north-east lies what may be a fulacht fia, a type of prehistoric cooking site typically identified by a horseshoe-shaped mound of fire-cracked stone and charcoal, the remains of a system that used heated stones to boil water in a trough. The proximity of the two features suggests the slope at Foulkstown saw repeated use across some stretch of prehistory, though the relationship between them remains speculative.