On the edge of Durness is a dramatic sea cave called Smoo Cave. Spent some time in there on a wet afternoon. Personally I like the colour casts caused by the mixed lighting in the cave. Although I have toned them down a little.
First image was a 30 second exposure in the second chamber of the cave. There is a third chamber, but that is normally only accessible by boat and over the few days we were in Durness it was completely underwater!