The ecclesiastical buildings of the island retreat in Lough Derg are usually visible from the southern shore. Here the R233 from Pettigo suddenly ends after taking the traveler northwards through the wilderness for a few miles. And for the occasional visitor this will also mark the end of the journey - unless you are going to the island on a spiritual search you will not be allowed to proceed.
Proceed you should if you are looking to experience the total immersion into Irish spirituality (of the Catholic persuasion).
This is not a tourist attraction - this is a pilgrimage site strictly open to those seeking meaning and direction (or simply quiet contemplation) only. Visits of the "quick look, photo and away again" kind are definitely discouraged. But for any traveler wanting to experience the spirituality of Ireland, Lough Derg (also known as Saint Patrick's Purgatory) is worth serious consideration.