Medieval church ruins and Our Lady's Well nearby
Wikipedia's article on Mulhuddart describes ruins of an older church, called the Church of Mary, on a hill above the village, associated with a holy well known as Our Lady's Well that the article says was used by pilgrims. The ruins are described as post dating the Anglo Norman settlement of the area and standing on a mound suggesting an earlier structure. This is a separate site from the current St Luke the Evangelist Church.