Belfast

Belfast is the cruise capital of Northern Ireland and the closest port to almost every Game of Thrones filming location in the UK. The Stormont and Cathedral Quarter are a short taxi or shuttle from the cruise terminal. Day-trip distance covers the Giant's Causeway, the Dark Hedges (the Kingsroad), Cushendun Caves, and Carrickfergus Castle. Belfast itself anchors the Titanic Quarter — the ship was built here, and the Titanic Belfast museum sits where the slipways used to be.

Belfast is the closest cruise port to nearly every UK Game of Thrones filming site — and the place Titanic was built.