Fenian Cycle
The adventures, or "echtrae", are a group of stories of visits to the Irish Other World (which may be westward across the sea, underground, or simply invisible to mortals). The most famous, "Oisin in Tir na nÓg" belongs to the Fenian Cycle, but several free-standing adventures survive, including "The Adventure of Conle", "The Voyage of Bran mac Ferbail", and "The Adventure of Lóegaire".