Hell Fire Club Bird Watching Dublin The Hellfire Cub is an old ruined building in the Dublin Mountains. It overlooks Dublin city and there are spectacular views form the top of the hill. It is also a popular bird watching site in South Dublin. Song ThrushRobinSmall Heath ButterflyBlackbirdChaffinchesBusy BeeBlackbird - FemaleCoal TitBullfinchSpeckled Wood ButterflyChiffchaffGreat Tit