It’s geography: http://www.visitscotland.com/about/arts-culture/films/locations
Outlander: http://www.visitscotland.com/about/arts-culture/outlander/film-locations
The map isn’t complete but still interesting: 
http://www.visitscotland.com/about/arts-culture/outlander/map/
Rannoch Moor and Cairngorms are stunning.
Glenfinnan Viaduct 3, MPR 7-11-15
Sit on the left side of any train to Mallaig for this view.