Thanks VBB for your informed post .. I have just had a quick look in Rosemary Hill's very readable book on Stonehenge and there are some reproductions of pre (and early) 20th century images:

"Turner's watercolour view, engraved by Robert Wallis,1829. The shepherd lies dead in the storm, the sheep abandoned. For the Romatics the stones were predominantly a place of psychic dread and terror" This image shows a ruined Stonehenge. (Chapter 4)

There is also a photograph of about 1896 showing the fallen western trilithon and the timber supports propping the leaning stones.