Blarney Dolmen Portal Tomb and Blarney Castle Gardens

Blarney Castle (Irish: Caisleán na Blarnan) and gardens are in the town of  Blarney (Irish: an Bhlarna), approximately 8 km (5.0 mi) north-west of the city of Cork, Ireland (Irish: Corcaigh, Éire). The gardens of Blarney Caste covers 60 acres of parklands which include gardens, avenues, arboretums and waterways. Within the grounds of Blarney Caste are the remains of what could be a portal tomb. There is some doubt if this a dolmen or a natural feature. It is in the rock close part of grounds of Blarney Castle  which are well worth visiting.

Link: Blarney Castle image of rock circle (not the dolmen) in the gardens courtesy of their website.