The well itself was filled in around 1880, yet the site retained enough memory and meaning that its physical traces were never entirely cleared away. The slab reads "IHS 1760 THOMAS BANKS", and according to the Ordnance Survey Name Books, it was erected by a man who believed he had been cured of blindness at this spot. Whether the tree grew around the stone over decades, or the stone was set among the roots as the elm established itself, the result is a peculiar kind of accidental reliquary, the landscape quietly absorbing what people left behind.

The folklorist Caoimhín Ó Danachair recorded the site in 1955, drawing on earlier Ordnance Survey sources that show the well already named "Sunday's Well" on the 1840 map. Holy wells dedicated to or named for Sundays are not uncommon in Ireland, and this one followed a familiar pattern of devotional use: the Name Books note that stations were performed here by local people on Sundays. Stations at a holy well typically involved a set circuit of prayers, often walked a prescribed number of times around the well or nearby markers, sometimes barefoot. The 1760 date on the Banks slab predates the filling of the well by over a century, suggesting the site had a long period of active use before it was closed off. Ó Danachair photographed the site in 1954, a year before publishing his account, and those photographs are held by the National Folklore Collection at UCD, accessible through the Dúchas archive online.

The well is located in a farmyard at Lissaleen, which means access would depend on the goodwill of whoever works the land. The site is not a managed heritage location, and there are no facilities or waymarked approaches. Anyone with a serious interest in the slab itself might find the 1954 photographs on the Dúchas website useful before visiting, as they show the stone and tree as they appeared in the mid-twentieth century. The National Folklore Collection reference numbers are F025.21.00210 and F025.21.00211.