I have never failed to stop and look at the prairie dog village downslope from one of the front-nine greens (can't remember which! it's been too long now) at Sutton Bay.
I hope that both Sutton Bay and the prairie dog village will be as permanent as this world allows -- or, better yet, more so!
One of my favorite structures on a golf course is the barn to the left of the fairway on No. 11 at StoneRidge (Stillwater, Minnesota) -- the site of my most unlikely par, after my drive smashed off the barn and ricocheted back into a world-class thick lie just outside, or just inside, the water hazard that guards the 10th green, but is supposed to play no role in the play of No. 11.
There's a very pretty red barn to the right of No. 1 green at Baker National (Medina, Minnesota). It comes into play, occasionally, though it shouldn't. It's my favorite thing on that course.
When I think of Sand Hills, the first thing that comes to mind -- before any of the holes -- is the windmill to the left of 18.
I remember a very cool-looking church steeple behind some hole at Highlands Links (Cape Breton, Nova Scotia) -- but I don't think it was ON the golf course.