At the centre of a graveyard in Cowanstown, County Kildare, two gable walls stand facing each other across what was once a roofed chapel, with headstones and table tombs filling the space between them where a floor used to be. The western gable is the more striking of the two: thicker than its eastern counterpart at 1.27 metres, it carries a double bellcote, a small masonry structure with two openings designed to hold bells, rising from the top of the wall. The eastern gable holds a round-arched window that appears to have been rebuilt at some point, while the west contains an altered square-headed window. Everything else, the side walls, the roof, the interior fittings, is gone. Two metres east of the eastern gable, almost within touching distance of the ruin itself, lies a holy well known as Lady's Well.

The chapel functioned as a chapel of ease, a secondary place of worship built to serve people who lived too far from the main parish church to attend regularly, connected in this case to the early church site at Taghadoe, a short distance away. Its formal name appears in Inquisitions from the reign of James I, dated to between 1603 and 1625, where it is recorded as "our Lady's Chapele near Taghtoo." Locally, however, it was simply called Lady's Chapel, and it had its own liturgical life tied to the Marian calendar. Lady's Day, the feast of the Assumption on the fifteenth of August, was once marked here with a pattern, a traditional gathering at a sacred site combining religious observance and communal celebration. By the time the Ordnance Survey Letters were compiled in the early nineteenth century, that custom had already lapsed, the pattern having ceased "some years back," as the record puts it, without fanfare or explanation.