Kohler, Wis.
The first of three entries on this list for designer Pete Dye, this course can be found on an abandoned Army bombing range along Lake Michigan. His wife Alice helped design Whistling Straits, adding hazards she felt would result in double bogeys — or perhaps even worse — for the top professionals. The plan worked. When the PGA Championship was played here in 2004, England's Lee Westwood said of the layout, "I'd been told there are 10 difficult holes and eight impossible ones. I'm still trying to work out which the 10 difficult holes are."