I've read that Vanburgh considered SDH his masterpiece, in principle anyway as his vision was never fully realised. I once asked him (or at least the spectral Thespian that lurked around Castle Howard a few years back) his opinion on the matter and he looked frankly baffled (there's a moral here of course, don't visit country houses whilst pissed, but it was our honeymoon...). It's a haunted landscape for sure, with the ghost of Sir Francis D lurking in the sea fret along with those of the 199 Miners of Hartley who died in the disaster of 1862. So much for social class, eh?