Smailholm Tower. Looks like something out of Middle Earth. The terrain's not exaggerated much either.
Bemersyde House. As Thomas the Rhymer said "Tyde what may, what'er betide, Haig shall be Haig of Bemersyde."
These were painted by E.W. Haslehurst for The Scott Country, written by John Geddie, for the Beautiful Scotland series.