At the eastern end of the Preseli range is the magnificent summit of Foel Drigarn, sometimes known as Moel Trigarn. The remains of stone ramparts, banks and ditches enclose the hilltop and are additional to the natural cliffs and crags.

The interior is dominated by three massive and well-preserved Bronze Age cairns. The presence of these sacred burial places, which pre-date the Iron Age, provide evidence of the Celts continuity of respect for the dead they were left untouched by the Iron Age fort builders.

Depending on the direction of light and the growth of heather, many platforms can be seen today. Over 220 house platforms have been identified in the past, some of which have been excavated.

The fort has three defended enclosures, with simple gaps in the defences marking the original entrances to the fort.
There have been numerous interesting finds on the site, including Iron Age and Roman spindle whorls, pottery and stone vessels, glass beads and jet rings. Most of these finds can now be seen in Tenby Museum.

Directions
From Crymych on the A478, take minor road west towards Mynachlog Ddu for 1.3km. At the road fork keep left, then park at signed footpath on the right hand side of the road. Follow the path over the moor and up to the summit of the hill.