Glen Coe, Scotland
Glen Coe is a volcanic glen in the Highlands of Scotland. It lies in the southern part of the Lochaber committee area of Highland Council, and was formerly part of the county of Argyll. It is often considered one of the most spectacular and beautiful places in Scotland.
The 39 Steps (1935)
Many of the scenes of Robert Donat — or rather, his double — running across the rugged Scottish terrain were filmed by a second unit team led by Penrose Tennyson in Glen Coe, specifically in an area known as "The Study".
As with the use of the Forth Bridge, Hitchcock used artistic licence to ignore the geography of Scotland — by road, Glen Coe is over 100 miles from where Hannay leaves the train and would have taken several days to walk.
This area of Glen Coe is popular with filmmakers and has been used as a location in many films, including Highlander, Monty Python and the Holy Grail, Rob Roy and Harry Potter and the Prisoner of Azkaban.