There is nothing to see at Walterstown, and that is precisely the point. A low ridge in level Kildare pasture holds the ghostly outlines of six small subrectangular enclosures, none of them visible to anyone standing on the ground. They exist, as far as the eye is concerned, only from the air.

The enclosures were identified through aerial photography, appearing as cropmarks on a GSI survey image. Cropmarks form when buried features, such as the ditches or walls of ancient enclosures, affect the growth of overlying vegetation. Soil above a filled ditch retains more moisture and nutrients, producing lusher, darker growth; soil above a buried wall or compacted surface does the opposite. In dry summers especially, the difference shows up clearly from altitude, sketching the plan of structures that have otherwise vanished entirely. At Walterstown, six such outlines cluster together on the ridge, their subrectangular shapes suggesting organised, probably agricultural or domestic use of the landscape at some point in the past. When the site was visited on the ground, no earthworks of any kind were detectable, the heavy grass cover offering no clue whatsoever that the field held anything at all.