NGRef: SH2182
OSMap: LR114
Type: Minor Settlement, Signal-station

Roads
None identified

Caer y Twr - The Encampment of the Tower

Enclosing an area of 7ha around the rocky summit of Holyhead Mountain, this hillfort had massive drystone-wall defenses on only three sides, there being no need on the south due to a sheer escarpment. There was an entrance on the north-east. Unexcavated, but very likely pre-Roman in origin and apparently re-used during the Roman period to site a military signal tower or perhaps a pharos or lighthouse.