What makes this site in Castlegar, County Galway, stranger still is that nothing of it remains at all. A modern bungalow now occupies the ground where the building once stood, and there is no visible surface trace left to suggest anything was ever there.

The first edition of the Ordnance Survey six-inch map, produced in the nineteenth century and representing one of the most systematic early surveys of the Irish landscape, marks the structure with the annotation "in Ruins" while simultaneously depicting it as a rectangular, roofed building oriented roughly east to west, approximately twenty metres long and twelve metres wide. That combination, a roofline drawn on the map yet labelled as ruinous, suggests a building that was at least partially standing when surveyors passed through, perhaps retaining its walls and some covering, but already long out of use. The site sits on the eastern side of a byroad in fairly flat scrub and pastureland, a setting with nothing about it to suggest the ground has any particular history.

For anyone curious enough to seek it out, there is very little to find. The landscape offers no earthworks, no overgrown stonework, no crop marks visible from the road. The chapel at Castlegar belongs to a category of place that survives only in map ink and inventory records, its physical presence entirely absorbed by the ordinary business of later centuries.