Monterey Country Club in Blue Ridge Summit, PA (1885). It's a primitive, short 9-hole course that somehow has survived up until the present day -- in pretty much its original state. I only live about 10 miles from there, on the Maryland side of the line.
The name sounds odd given the geographical location. Actually it sits atop Monterey Pass, which was a key retreat route for Lee's Army of Northern Virginia following the battle of Gettysburg. Practically right next door sits the Monterey Pass Civil War battlefield site (July 5, 1863).
"Country Club" is also a misnomer. You just pony up your 10 bucks and play.
Also strange is that the major hazard/feature of the course is wetlands, which border almost one whole side of the property. Pretty unusual to have high altitude bogs and such on top of mountain passes in these parts. There are a few bunkers too, of course not excavated or maintained in any kind of aggressive fashion.