The ruins of Cong Abbey, a former Augustinian abbey, date mainly to the 13th century and showcase some of Ireland’s finest medieval ecclesiastical architecture.
A church was first built here in the 7th century, reportedly by Saint Feichin. After a fire in 1114, Turlough Mor O’Connor, High King of Ireland, refounded the abbey, which was later destroyed in 1137 and rebuilt in 1138 as an Augustinian settlement. His son, Ruaidrí Ua Conchobair, Ireland's last High King, expanded it in 1198 and spent his final years there.
The O'Duffy family was closely linked to the abbey from 1097 to 1501. Archbishop Muireadhach Ua Dubhthaigh, who died there in 1150, is commemorated on the Cross of Cong. The abbey was reconstructed in 1307, dedicated to St. Mary, and suppressed after 1542. Its last nominal abbot, Patrick Prendergast, preserved the Cross of Cong before his death in 1829. Benjamin Guinness initiated its restoration in 1855.
Cong Abbey features exceptional early Gothic architecture, including a 13th-century church, cloister fragments, and finely sculpted doorways. A monks' fishing house, likely from the 15th or 16th century, sits over the River Cong, with a trapdoor for fresh fish and a rumored line to the monastery kitchen.
The first written record of church in Danmark locality date back to the year 1291. Close to the church are several stones with a Christian text and cross inscribed. The oldest parts of the present red-brick church are from the 1300s. In the late 1400s the church was enlarged to the appearance it has today. The church has been modified both internally and externally several times, among other things after the fires in 1699 and 1889. There are lot of well-preserved mural paintings in the walls.