On the eastern banks of the River Mattock, which creates a natural border between Counties Meath and Louth, lie the remains of Mellifont Abbey, the first Cistercian monastery in Ireland. Founded in 1142 by St. Malachy, it was inspired by the formal structure surrounding a courtyard of St. Bernard of Clairvaux's monastery, which St. Malachy had visited.
Among the substantial ruins are the two-story chapter house, built in 12th-century English-Norman style and once a daily meeting place for the monks; it now houses a collection of medieval glazed tiles. Four walls of the 13th-century octagonal lavabo, or washing room, still stand, as do some arches from the Romanesque cloister. At its peak, Mellifont presided over almost 40 other Cistercian monasteries throughout Ireland, but all were suppressed by Henry VIII in 1539 after his break with the Catholic Church. Adjacent to the parking lot is a small architectural museum depicting the history of the abbey and the craftsmanship that went into its construction.