Ardfert Cathedral was built between the 12th and 17th centuries on the site of St Brendan The Navigator’s 6th-century monastery. The romantic ruin now managed by Heritage Ireland retains much from those years. Especially impressive are the Romanesque west doorway, the 13th-century east window, and a beautiful row of nine lancet windows in the south wall. Also here are two smaller churches. One is a fine example of the late Romanesque style.