At Ballyhussa in County Waterford, something lies buried in a field that most people would walk past without a second glance. The ground looks ordinary enough on a gentle south-westerly slope, but aerial photography has revealed the ghostly outline of a double ring-ditch: two concentric circular ditches, the inner one roughly ten metres across and the outer around twenty metres, pressed into the earth and invisible from ground level. The only time they reveal themselves is through the phenomenon of cropmarks, where buried features cause overlying crops to grow at different rates, producing faint but legible patterns when viewed from above.

Ring-ditches of this kind are generally understood to be the remains of prehistoric funerary or ceremonial monuments, often the eroded traces of round barrows or burial mounds whose earthen banks have long since been ploughed flat. The double configuration at Ballyhussa, with one circuit sitting concentrically inside another, is a less common arrangement and raises questions about the sequence of its construction or the complexity of whatever ritual use it once served. Without excavation it is impossible to say whether the ditches belong to the same period or represent two distinct phases of activity on the same spot, centuries or even millennia apart.