The Celts were prolific road builders, but sadly their trackways were constructed from wood, meaning few have survived the ravages of time. Luckily, some passed through bogs and have been well preserved, enabling us to learn more about them. The Corlea Bog in Ireland is home to one of the most complete Celtic timber trackways yet discovered; the tree-rings on the wood point to a felling date of 148BC, long before the Romans arrived and began building roads. There is also evidence to suggest that many Roman roads were built on top of the original timber trackways put there by the Celts.
