At the risk of being rediculed, I will nominate #14 at Boundary Oak, the Robert Muir Graves design in Walnut Creek, CA. This is something I find hard to find, a truly interesting three-shot par 5. The green is narrow, but the third shot is up the length of it, so it's fair, and is protected by a bunker to the right. It's a two-tiered green, and steep, so being below the hole is a must. The difficulty of the green dictates the rest of the hole, as the objective is to get close enough to hit the third shot with some spin or trajectory to try and control it. The fairway is a dogleg right that slightly tilts left, so the ideal would be a slight fade to the center of the fairway. Too much and you're blocked out by trees on the right. A pull left is dead, into a thick stand of the trees and the course boundary fence. The second shot must carry a bunker at the right corner of the dogleg. Making the approach more difficult is that it's almost always an uphill lie.
I really like this course, and I know it's difficult enough that the Spanos Tour, one of the NoCal mini-tours, used to have an event here. The greens are very challenging, because the course is build on the side of a hill, and I think the topography was used well. I enjoy playing there.