Rolling Rock was the private Mellon estate. Donald Ross is credited for 9 holes. It used to be mentioned as "the best" 9 hole in US. They built a second 9 in late 90s.There are two clubs in Ligonier, PA. They are The Rolling Rock Club, old old, old money. Also Laurel Valley golf club. You should check them out. They are really affordable, something like 75k a year I think for starters. My son worked at the R&R club and one time was tasked to go build a fire in the fire place in the room of Tucker Carlson. Man to have that kind of Jinga.
Rolling Rock is/was very prestigious. Large international membership. However, people go to RRC for hunting, fishing, shooting, etc. And maybe for golf. I would not rank it a great golf course however, I would say it is a great experience if you get a chance to go there.
Laurel Valley is a much better golf course and a great experience. Also an international membership and until late 80's only corporate members.
Ligonier CC is a mile down the road. It caters to the locals and is nice but not as fancy. Same with Latrobe about 10 miles away.