Others are so faint they exist primarily as shadows on a screen. At Bawnoge in County Wicklow, a roughly circular enclosure of approximately forty metres in diameter is visible only from above, its outline barely discernible on aerial imagery, the kind of feature that most people would scroll past without a second thought.

The enclosure came to light through Google Earth aerial photography, with an image dated 21 June 2010 capturing enough of its circular outline to flag it as a possible archaeological feature. Circular enclosures of this type are broadly associated with early medieval settlement in Ireland; a ringfort, to use the common term, was typically a farmstead enclosed by one or more earthen banks and ditches, offering a degree of protection for a family and their livestock. Whether this particular site functioned in that way remains unconfirmed, which is why it sits in the record as a possible enclosure rather than a classified one. A second possible enclosure lies roughly two hundred metres to the north, which raises the quiet question of whether the two features were ever related, though the evidence does not yet exist to answer it. The site was identified by Paul Daly and compiled by Caimin O'Brien.

Because the feature is essentially invisible at ground level, there is little a visitor could usefully look for without specialist equipment or prior knowledge of the exact location. What the site represents, more than anything else, is the degree to which the Irish landscape continues to yield traces of past occupation through the patient application of aerial observation, long after the physical evidence has been reduced to a faint smudge in the soil.