Climbing the Rocks, Dumbarton Castle, Scotland. by Benjamin West Kilburn https://www.rawpixel.com/image/14293948/climbing-the-rocks-dumbarton-castle-scotland-benjamin-west-kilburnFree Image from public domain licenseUnidentified view of a castle in Scotland by Benjamin West Kilburn https://www.rawpixel.com/image/14296386/unidentified-view-castle-scotland-benjamin-west-kilburnFree Image from public domain licenseThe Outer Court, from the Top of the Fore-Hall Stair. by Thomas Annan https://www.rawpixel.com/image/14317581/the-outer-court-from-the-top-the-fore-hall-stair-thomas-annanFree Image from public domain license