In a field near Conlanstown in County Kildare, nothing is visible to the naked eye at ground level. The site reveals itself only from the air, as a set of cropmarks, the faint discolouration in growing crops caused by buried ditches and earthworks that alter how plants absorb moisture and nutrients. What those marks outline is a layered and geometrically unusual arrangement of enclosures that has left no surface trace whatsoever.

An aerial photograph, reference GB90.BB.04, records a circular enclosure defined by a fosse, essentially a broad defensive or boundary ditch, positioned slightly off-centre within a larger, D-shaped enclosure, also defined by a fosse. This nesting of a circular form inside a D-shaped one is already an uncommon arrangement, suggesting the site may have evolved across more than one phase of use or construction. The complexity does not stop there. A second large D-shaped enclosure, likewise defined by a fosse, is conjoined to the first and extends out to the south and east. Tucked against the inside of the outer eastern fosse is a small curvilinear structure, the function of which remains unknown. The overall plan, with its overlapping geometries and attached subsidiary feature, points to a monument that was added to and reorganised over time rather than built to a single design.

Because the site exists only as cropmarks, there is little to see during a visit without aerial or photographic reference material to hand. The marks are most legible from aircraft or in aerial imagery taken during dry summers, when soil moisture differences between ditched and undisturbed ground become most pronounced.