Shop Amazon Foder's Essential Ireland Onaght Castle Townland of Onaght (Inishmore) in Inishmore Island Type: Castle Travel Genus: Sight Sight Category: Building As Noted In: Irish National Monument, Department of Culture, Heritage and the Gaeltacht Onaght Castle is a historic castle and Irish National Monument in Onaght (Inishmore), Province of Connacht, Republic of Ireland. - AsNotedIn Shop Amazon Amazon Books Travel Advertisement