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...

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