This is said as the evidence of what the site was would seem to make a better case for Annadorn originally being a passage tomb. There is a written account of a visit in 1802 that states that the site of Annadorn formerly sat beneath a large rectangular cairn over 18 meters in diameter and was approached by a lintelled passage.
What you can see today is a large impressive cap that sits on a rectangular chamber of many small stones with three large side stones that can clearly seen (even when the grass is overgrown).
Annadorn (which is signposted) is located a short drive from the A2 road.
Although the sites enclosure is on a bad bend on the road, parking can be found quite close leaving you a with a small climb up the steps to the site.