|National Trust - Leicester Centre - FDC Staunton Harold Appeal 24 June 1981|
These stamps were issued on 24 June 1981 to commemorate the 50th anniversary of the National Trust in Scotland. However only two of the five stamps are covering places there - Glenfinnan and St Kilda.
You can spend quite a time studying the geology associated with the stamps. But if you don't subscribe to science you could walk in the footsteps of giants when you visit Antrim's UNESCO World Heritage Site - the basalt columns that make up the Giant Causeway in Northern Ireland. A simple explanation of how they were created from lava flows can be viewed by following the links to the National Trust slideshow here
I'll leave you to check out the other stamps - along with those at Viridian's Sunday Stamps