The impressive remains of 13th-century Ardfert Cathedral (heritageireland.ie; adult/child €5/3), open mid-March to September, are notable for the beautiful and delicate stone carvings on its Romanesque door and window arches.
Set into one of the interior walls is an effigy, said to be of St Brendan the Navigator, who was born nearby and founded a monastery here. Other elaborate medieval grave slabs can be seen in the visitor center. Ardfert is 9km northwest of Tralee on the Ballyheigue road.