The glen, tucked into the Burren in County Clare, is best known as the findspot of the Gleninsheen Gorget, one of the finest examples of Late Bronze Age goldwork ever recovered in Ireland, discovered in a rock crevice in 1932. That a cashel, the term used for a stone-built ringfort, occupies the same townland adds another layer to what is already an unusually significant patch of ground.

A cashel is essentially a ringfort constructed from dry-stone walling rather than earthen banks and ditches, and the form is particularly common across the rocky terrain of the Burren, where loose limestone lies close to the surface and earth-digging would have been impractical. These enclosures were typically built during the early medieval period, roughly between the fifth and twelfth centuries, and served as farmsteads for farming families of some local standing. The combination of a defended enclosure and the surrounding Burren landscape, itself dense with megalithic tombs, wedge graves, and field systems spanning thousands of years, places this cashel within one of the most archaeologically layered regions in the country.

Gleninsheen lies within the Burren National Park, and the wider area around Caherconnell and Poulnabrone is well walked and reasonably accessible. The limestone pavement and the low, creeping vegetation of the Burren mean that stone monuments tend to remain visible at ground level in a way they might not elsewhere, though individual sites vary considerably in how legible they appear to the untrained eye. The gorget itself is held in the National Museum of Ireland in Dublin, a reminder that some of what made Gleninsheen remarkable was carried away long before formal protections existed.