Overview: New, fantastically beautiful views await behind every bend: heather-covered hills that glow purple, picturesque lakes and deep green forests. These are the Scottish Highlands. But what would these still largely untouched spots be without the people who live here? For their 90-minute, visually stunning travel documentary, authors Babette Hnup and Maik Gizinski and their camera team set out on the train route of the legendary “Highland Main Line,” which runs through the middle of the Cairngorms National Park.