At Westpalstown in north County Dublin, a circular enclosure ringed by two concentric earthen banks, what archaeologists call a bivallate enclosure, survives not as a visible ruin but as a crop mark: a ghostly outline that only reveals itself in aerial photographs, when differential growth in the field above betrays the buried earthworks below.

The enclosure sits in the north-east corner of a large open field that once contained Westpalstown House, and it occupies what is described as the highest point in that field, affording extensive views to the south and south-east. That positioning is unlikely to be accidental. Elevated, defensible ground with long sightlines was precisely what early enclosed settlements in Ireland tended to seek out, and the double-bank construction suggests a site of some deliberate formality or status. The record was compiled by David O'Connor and updated by Christine Baker, with the association to the nearby monument DU007-029 noted through correspondence with archaeologist T. Condit. The site is logged on the Sites and Monuments Record for County Dublin.

Because the enclosure survives largely below the ploughsoil, there is little to see at ground level beyond a gentle rise in the terrain. Visitors with an interest in the site would do best to approach it with an aerial image to hand, whether from the SMR database or a satellite mapping tool, since the crop mark geometry is far more legible from above than anything the field surface will offer. The surrounding landscape is agricultural and privately managed, so access to the field itself would require landowner permission. The views south and south-east that the site commands, across the flat north Dublin countryside, remain much as they would have been when the enclosure was first constructed, and that continuity of prospect is perhaps the most tangible thing the place still has to offer.