There are plenty of par 4 examples, but par 5s less so.
One that does come to mind is the 3rd at County Louth (Baltray). Its about 530 yards, and the approach to the green is blind, so whether you are trying for the green in two shots or have laid up and its your third shot, its likely to be a blind approach. However its a narrow green with a big run off area of fairway to the left falling away that can leave you with probably a 20 to 30 yard approach from way left and below the green if you miss left.
So if you are trying for the green in two, you cant quite tell where the green or flag are other than the marker post on the ridge in front of the green that makes it blind, and so its very easy to miss left and have a tricky 3rd. However if you lay up just short of the ridge you can walk up and have a check of the line, making for a much easier approach. Or that's how I remember it from my couple of plays anyway. A great combination of the excitement of cresting the hill to see how the ball has finished and the risk reward of going for it in two while its blind.
Another good example would be the 3rd at Royal Cinque Ports (Deal) but I suspect that is better known to many of the group here.
Cheers,
James