In this episode, Martha travels north, taking in the extraordinary beauty of Dunluce Castle, and onwards to Mussenden Temple - only a romantic would expect to find a house here and only a lunatic would build it. She marvels at how Belfast was shaped by the Victorians, and visits Kearney Point on the Ards Peninsula to find out what's in a name. And she journeys south to Dunmoe, overlooking the site of the Battle of the Boyne.