Helen Skelton is in Snowdonia looking at how the landscape has undergone many transformations down the ages. From heavy industry and hard work, to high octane thrills and fearless fun, Snowdonia is an area that has never stood still. Helen visits the traditional slate mines that first shaped the land. She learns of the part nuclear played in making Snowdonia a powerhouse of 20th century energy production. And she takes to a high zip wire to test her nerves in Snowdonia's latest adrenaline playground. Whilst she's seeking the ultimate in thrills she looks back at some of the other ways Countryfile has shown the transformation of our landscape. Like the time Julia and Matt helped light beacons as the entire length of Hadrian's Wall was transformed by light. Or how Jules Hudson discovered the part that the landscape has played in transforming the fortunes of soldiers blighted by war. And the time Ellie Harrison visited Canvey Island to see for herself the amazing transformation old an old brownfield site to major wildlife reserve.