Of course, there are a lot more links to the places/businesses mentioned.
I only quote those that gave me a permission to do so.
Thank you very much to everyone who contributed.
I am sure you will find all further information via your search engine.
If you discover any broken links please let me know...
Official website of Dunnottar Castle
Official website of Dunvegan Castle, Isle of Skye
Official website of Edinburgh Castle
Eilean Donan Castle
Information on Eilean Donan Castle, Highlands
Find out about Inverewe Gardens and Estate, Highlands
Royal Botanic Garden Edinburgh
Official website of the Royal Botanic Garden Edinburgh
Urquhart Castle - one of the most popular spots on Loch Ness
St. Andrews Castle
Information on St. Andrews Castle, Fife, provided by Historic Environment Scotland