A bit of Castlerigg Stone Circle at 1min 55
Short film from 1943
https://player.bfi.org.uk/free/film/watch-the-peoples-land-1943-online
Calanais at 7mins 30
Film from 1938
https://player.bfi.org.uk/free/film/watch-bonnie-scotland-calls-you-1938-online
Stonehenge in 1901
https://player.bfi.org.uk/free/film/watch-stonehenge-panorama-of-the-ancient-druidical-remains-1901-online
Really nice footage from 1932
10:02 - Jarlshof excavation 11:31 - Ring of Brodgar
https://movingimage.nls.uk/film/1928
More Jarlshof, Skara Brae etc from 1937
https://movingimage.nls.uk/film/3575
Knowe of Rowiegar chambered cairn is pretty much grassed over nowadays.
https://www.themodernantiquarian.com/site/396/knowe_of_rowiegar.html
Nice footage from 1937 showing what's beneath the grass
https://movingimage.nls.uk/film/2360
Knap of Howar excavation from around 1937
https://www.themodernantiquarian.com/site/207/knap_of_howar.html
https://movingimage.nls.uk/film/3576
Profile of artist Paul Nash
Bit of Avebury 14:50 (whole thing is worth a watch)
https://player.bfi.org.uk/free/film/watch-landscape-from-a-dream-1978-online