And now the epic locations for the fantasy-drama series, based on the bestselling book by George R.R. Martin, are being promoted by the tourism industry with Collette tours packaging trips to Croatia and Iceland. Croatia offers the seaside resort Opatija and “Old Dubrovnik,” whose old city walls set the stage for “King’s Landing,” home of the Lannisters and current Iron Throne. The Diocletian’s Palace, a late-Roman historical monument, is a significant Season 4 location. Iceland has been the location beyond “The Wall” for the first three seasons, but there’s more with Iceland’s 100-foot double cascade Gullfoss Waterfall and Thingvellir National Park to be featured locations in Season 4.