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...

Dunnottar Castlehttp://www.dunnottarcastle.co.uk

Official website of Dunnottar Castle

Dunvegan Castle

www.dunvegancastle.com

Official website of Dunvegan Castle, Isle of Skye

Edinburgh Castle

https://www.edinburghcastle.gov.uk/

Official website of Edinburgh Castle

Eilean Donan Castle

https://www.visitscotland.com/info/see-do/eilean-donan-castle-visitor-centre-p248371

Information on Eilean Donan Castle, Highlands

Inverewe Gardens

https://www.nts.org.uk/Visit/Inverewe/

Find out about Inverewe Gardens and Estate, Highlands

Royal Botanic Garden Edinburgh

http://www.rbge.org.uk/

Official website of the Royal Botanic Garden Edinburgh

Urquhart Castle

https://www.visitscotland.com/info/see-do/urquhart-castle-p245811

Urquhart Castle - one of the most popular spots on Loch Ness

St. Andrews Castle

https://www.historicenvironment.scot/visit-a-place/places/st-andrews-castle/

Information on St. Andrews Castle, Fife, provided by Historic Environment Scotland