... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... This takes you past the village of Killylea (about 5 miles from Armagh), and then across the River Blackwater past the entrance to the Caledon Estate and into the architecturally attractive village of Caledon, approximately nine miles from Armagh. ... View of the Knockmany Chambered Cairn from the south, showing the modern enclosure. ... In its present state the cairn is an almost circular mound approximately 25m in...