The earthwork at Fantstown is the kind of monument that rewards attention paid to the landscape itself rather than to any visible architecture, because there is almost nothing left to see at ground level. What survives is essentially a memory pressed into the earth, legible now mainly through aerial photography and the faint logic of soil chemistry.

The monument was recorded as a circular enclosure on the Ordnance Survey six-inch map of 1840, suggesting it was still a recognisable feature in the mid-nineteenth century. By the time the twenty-five-inch edition was produced in 1897, it was described as a raised circular area roughly seventeen metres in diameter, defined by a scarp, the term for a steep slope or face of earthen material, and an external fosse, which is simply a ditch dug around the perimeter. That combination, a raised interior with a surrounding ditch, is typical of a class of enclosure monuments found widely across Ireland, though precisely what this one was used for remains unrecorded. Sometime after 1897, the raising was levelled, likely as part of agricultural improvement works, and the site was absorbed into the surrounding pasture. A drainage ditch running in a north-east to south-west direction now cuts through the north-eastern edge of what was once the enclosure. The site sits approximately seventy metres south of the townland boundary with Gibbonstown, and a barrow, a type of burial mound, lies around a hundred and ten metres to the north, hinting that this corner of Fantstown had some significance in earlier periods.

The cropmark, the phenomenon by which buried features show up as variations in crop or grass colour due to differences in soil moisture and composition, is visible on Google Earth orthoimages compiled between 2011 and 2013. For anyone visiting, the location is in ordinary farmland and there is no formal access or interpretation. The site itself is unremarkable to the eye on the ground, which is rather the point. The most useful way to appreciate what was once here is to view the aerial imagery before going, and to look across the field at an angle in dry summer conditions, when soil and grass variations are most pronounced.