Six small enclosures sit in a field near Walterstown, Co. Kildare, invisible to anyone walking past them. No bank, no ditch, no upstanding earthwork of any kind survives above ground. The only evidence that something once occupied this low ridge in well-drained pasture is a set of subrectangular cropmarks, faint geometric outlines that show up on aerial photography when differential soil moisture causes grass to grow at slightly different rates over buried features. Where a buried wall or filled ditch alters how deeply roots can reach or how much water the ground retains, the vegetation above responds, and from altitude a ghostly outline appears.

The six enclosures form a close cluster, catalogued together as a group of related sites. They were identified from a single aerial photograph held by the Geological Survey of Ireland, and when the site was visited on the ground, the ridge showed nothing but a thick covering of grass. Subrectangular enclosures of this kind are found widely across the Irish midlands and can date from the prehistoric period through to the early medieval, often serving as farmsteads, animal enclosures, or small settlement sites, though without excavation the precise date and function of the Walterstown examples remain unknown. What can be said is that they sit in exactly the kind of position such enclosures favour: elevated just enough above the surrounding ground to be well-drained, with level land around them suitable for farming.