The sea mist made visibility here on the day we visited near impossible, down to about 20 yards. There's another cairn in an adjacent field but we couldn't get access to it (we didn't try that hard).
This cairn has been very much robbed of its material, in the process of which 3 cists were uncovered and excavated. The cairn has since been left alone.
The northern cist is a classic box, with six flagstones making up the structure. There's a small hole at the top western corner and I stuck my hand in and took a few shots. It was a tad unnerving, given that the cist would make a perfect hidey-hole for various critters. Another cist is visible towards the centre of the mound, but not as accessible as the northern one. We never found the third amongst the vegetation.
There is a cromlech in Byrne's field on Fieldstown Hill. The field is called Lios Dubh. Fionn Mac Cumhaill is supposed to be buried there. The cromlech is on the top of the hill. There are some stones standing upright in the ground and a large flat stone on the top of them. The stones are almost covered with clay and the place is overgrown with briars. Within the grave are bones.
Recounted by James Winters for the 1930s Schools' Collection of folklore in Ireland. Online at Duchas.ie.