Measuring 7.3 metres (23 feet) in length, it is recognised as being the longest stalactite in the Northern hemisphere. Doolin cave was discovered by English potholers exploring the honeycomb of caves tunnelled by the rivers that run underground through the soft limestone of Ireland's famed Burren country. The Great Stalactite has been opened up to the eyes of the world.Tours operate daily from Bruach na Aille Restaurant, a few minutes walk from the hostel.