The 4th at Medalist GC was mentioned on this thread last week. Another Norman influenced hole that may fit in the fortress category is the 8th at Meadowbrook Farms just west of Houston. This hole's green complex is in stark contrast to the others on the course which tend to be rather low-key. I actually like this factor as it makes the hole memorable. The 8th does not have bunkers so I do not know how well it fits the fortress definition. It is essentially a "volcano" with a 15-20 ft. drop down to creek floodplain on all sides. Unfortunatly, only the approach is cut to fairway height. This takes away any option of rolling or bouncing a recovery up the slope if the green is missed right, left or long. The slope is steep enough that balls roll to the base even on the sides and back. I bring this up because the Phil/Tiger flop shot that is required for recovery is not possessed by many players. I wonder what role the recovery shot plays in the design of a fortress style hole by today's architects.
I believe the inherent difficulty of recovery shots on fortress or volcano style holes is a major reason they have been disappearing. However, if the green surrounds have some sort of collection capability beyond the initial slope and are cut low enough to allow for the use of a putter, golfers of nearly all skill levels would have a chance (in theory). While I have not played the courses, this is what I see in the pictures of Langdon Farms and Kiawah. Of course, such a hole is different than the examples at Piping Rock or NGLA that are surrounded by rough and bunkers. They present more of a hit the green or your dead personality. Now I'm giving golf holes personalities, better wrap this up.
Just some thoughts.
-Daryn