Among its surviving antiquities is a penitential station, a category of site that tends to be overlooked precisely because it leaves so little to see. These stations were fixed points in a devotional circuit, known in Irish as a turas, where pilgrims would stop to pray, often kneeling on stone, reciting prescribed prayers, and sometimes moving barefoot across rough ground. The physical discomfort was deliberate; the body's suffering was understood as part of the spiritual work.

Inis Gluaire has a long association with early Irish Christianity. The island is traditionally linked with Saint Brendan, who is said to have founded a monastery there, and it appears in early Irish literature as a place apart, somewhere the boundaries between the earthly and the otherworldly were felt to be thin. The presence of a penitential station fits naturally into that context, suggesting a continuous thread of religious use stretching from the early medieval period into the centuries of post-Reformation practice, when outdoor pilgrimage sites often became more important as formal church structures came under pressure. The island also holds, according to tradition, the graves of the Children of Lir, figures from one of the most enduring stories in Irish mythology, which gives the place a layered quality, devotional and literary at once.

The island is accessible by boat from Blacksod Bay, though crossings depend on weather and local arrangement rather than any regular schedule. The penitential station itself is a modest feature in the landscape, and visitors who know what to look for will find more meaning in it than those who do not. The broader setting, low-lying, exposed, edged by Atlantic light, does much of the interpretive work on its own.