Ellie Harrison, Chris Hollins and Denise Lewis explore Northern Ireland. As one of the least touristy places in the UK, the province is brimming with secrets. Olympic gold medallist Denise Lewis is chastised for a lack of focus when she competes in an unusual and unique local competition. Chris Hollins goes in search of a witch's lair on the top of a mysterious mountain. And Ellie Harrison uncovers the secret history of an army training base that has been closed to the public for over a century.