3-Day Northern Ireland Small-Group Tour from Dublin. A 3 day exploration of the highlights of Northern Ireland including the iconic sites of The Giants Causeway, Belfast and the Titanic Quarter, one of the world’s great gardens at Mount Stewart, the brooding granite peaks of the Mourne Mountains and several of the dramatic locations used in the TV series “Game of Thrones”. For an in-depth insight into the wonderful scenery and history of this small country, this is the tour to choose. Book and Save 20%: 3-Day Northern Ireland Small-Group Tour from Dublin.