The Pentland Road, on the bed of a never built railway.
Going across the island there's a fine old road that takes you from Stornoway to Carloway. Single track all the way, a changing landscape from east to west and chances are, as it was for us, changing weather all the way over. If you are lucky and you catch the evening light you may see a purple haze that caught me unaware the first time I saw it. Thought it was the glass in the car window but when I opened the window it was still there. For a moment of two anyway. Then in no time it was gone again.