The stretch that really jumps out to me is 7-12 on Sunningdale's Old course. What a diverse--and a bit strange--stretch of holes.
It starts with the drive on 7, which is one of the funkiest looking blind drives I've seen. But then you clear the hill and see a magnificent view of the rest of the hole, framed by the pine forest. It's one of the biggest surprises that I've ever experienced on a golf course. Then you have two of the greatest short par 4s that I've played, 9 and 11, and two of the greatest long ones, 10 and 12.
As short par 4s, 9 and 11 couldn't be much more different. The drive on 11 is a bit of deja vu from 7, but in this case the placement is really important--the pitch is much easier if you're up the right side, near the line of trees. 9 is a great drivable par 4. It's pretty easy if the pin is on the left but if it's on the narrow back-right tier, I'm not sure I've seen a hole where the tee shot placement is so important.
And the same stretch at one of the other top heathland courses, Swinley Forest is almost as good. It's not as odd so it's not as charming, but 9 and 12 are two of the world's best long par 4s and I love the uphill approach into the 7th green.