Preserved beneath the bogland of Coolcarrigan in County Kildare lies a stretch of ancient road that was never meant to be seen again. Known as a togher, this type of trackway was built to carry people and animals across the soft, waterlogged ground of Irish bogs, using timber laid directly onto the peat. The technique was simple and effective: logs and branches placed transversely across occasional lengthwise timbers, creating a low platform that distributed weight across ground that would otherwise swallow a traveller whole.

The Coolcarrigan togher runs to 178.4 metres in length and spans roughly 3 metres in width, sitting at a depth of just 0.12 metres below the bog surface. What survives is a construction of transverse roundwoods laid upon sporadic longitudinal timbers, with scatters of slender brushwood nearby, the individual pieces ranging from about 2 to 6 centimetres in diameter. Several of the timbers show signs of burning, a detail that raises more questions than it answers. Whether the scorching happened before the wood was laid, during some later episode, or as part of the original construction process is not recorded. Bog environments are remarkably good at preserving organic material, as the cold, acidic, oxygen-poor conditions slow decay almost entirely, which is why such fragile structures can survive for centuries or even millennia.