Fairy fort

Fairy forts (also known as raths from the Irish, referring to an earthen mound) are the remains of lios (ringforts), hillforts or other circular dwellings in Ireland. From (possibly) late Iron Age to early Christian times, the island's occupants built circular structures with earth banks or ditches. These were sometimes topped with wooden palisades, and wooden framed buildings. As the dwellings were not durable, in many cases only vague circular marks remain in the landscape. Raths and lios are found in all parts of Ireland.