It's not bunker (though I do wonder if it once was?), but I do like the grassy hollow at the front of the Old Course's 13th (the original "Lions"?)...
Part of the appeal is because it is maintained as rough, and not sand - it becomes almost inconsequential in your mind, until you inevitably find it, steering clear of death on the right and/or sneaky elevation change pulls you up half a club short. The recovery is quite fun, and can be pretty varied if it hangs up on one of the flanking banks.
But as Tom alludes, its position is rarely dead centre, especially when you consider the range of hole locations, and the whole host of other features that it combines with to dictate the line of play.