Structural repair works have been progressed at a long-closed prehistoric cairn, built into the fabric of the Slieve Gullion area. And, it won’t be long before the public will once again be invited to visit. Constructed at 1,894 feet – or 577 metres – the structure – believed to date as far back as 3,000BC – is known locally as ‘Calliagh Berra’s House’. Located in an Area of Outstanding Natural Beauty in south Armagh, the Slieve Gullion ‘South C…