Archaeological evidence suggests this was once the site of Desertegny, an early ecclesiastical foundation dating back to Ireland’s early Christian period. The graveyard’s curved wall, running from east to south, likely follows the line of a much older enclosure, hinting at the site’s ancient origins and continuous use as sacred ground through the centuries.

At the heart of the graveyard stand the remains of a Roman Catholic church, built sometime during the 18th or 19th century and unusually aligned north to south rather than the traditional east to west orientation. The church ruins are surrounded by a collection of roughly carved stone crosses and cross-inscribed stones, testament to generations of local craftsmanship and devotion. These markers range from simple incised crosses to more elaborate carved examples, each telling its own story of faith and remembrance.

Perhaps the most intriguing feature is a cross-shaped stone located northwest of the church ruins. This particular monument bears a cupmark on each face; small, circular depressions that may have held ritual significance or served a practical purpose we can only guess at today. These cupmarks connect Greenhill to a broader tradition of prehistoric and early Christian stone carving found throughout Ireland, where such markings often appear on stones associated with sacred sites, boundaries, or burial grounds.