Dinas Dinlle

Dinas Dinlle is an Iron Age coastal hillfort above the shore south-west of Caernarfon, whose name recalls Lleu Llaw Gyffes, a hero of the medieval Welsh tales of the Mabinogi. The sea has already cut away 20 to 40 metres of its western defences since 1900, and Wales's Royal Commission on historic monuments warns the fort could be lost within 500 years if erosion speeds up. Excavations that began in 2019 uncovered a stone roundhouse about 13 metres across, among the largest found in Wales, with Roman pottery near its walls, and its remains can now be seen inside the ramparts. From the top the views run along the coast to Yr Eifl on the Llŷn peninsula. Reviewers say the fort is a short walk from the car park, but the sides are steep before the ground levels out. Dogs must stay on a lead because livestock graze here. The seafront cafes and toilets are not run by the Trust.