Access to Dumbarton Castle will be restricted as a survey gets underway to assess the impact climate change has had on the landmark.
Historic Environment Scotland (HES) is carrying out the work to analyse the extent of masonry deterioration and ensure the public are not exposed to any risks.
Dumbarton Castle will have restricted access in place while the work is conducted, as part of a national programme involving surveys on over 200 properties and sites across Scotland.
