I had a number of stamps to chose from for Viridian's geology/landscapes theme this week but finally settled for a set from 1966.
|Great Britain - Landscapes, 2 May 1966|
As is often the case in sets like this there is one from each of the countries - England, Ireland, Wales and Scotland. Somehow, to me, a castle seems out of place in a set like this.
For other scenes you should amble over and check out the links at Sunday-Stamps-155.