In the 6th century, St. Brendan The Navigator founded a monastery at this site near Tralee in County Kerry. Today, visitors can see three medieval churches, an ogham stone, and a number of early Christian and medieval grave slabs.

The oldest building is the cathedral, which dates from the 12th to the 17th centuries. It has a Romanesque west doorway, a magnificent 13th-century east window and a spectacular row of nine lancets in the south wall. One of the two smaller churches is a fine example of the late Romanesque style and the other is a plain 15th-century structure with interesting carvings.