The Hidden Gem of this thread would of course be the little course near the Susquehanna River in Central PA.
The Bucknell University Golf Club, Lewisburg, PA.
Actually, a charming little course, and they cut down a bunch of trees and especially evergreen trees in the past 10 or 15 years and made some other improvements and changes.
First nine designed by Emil Loeffler in 1930, the second nine by Ed Ault in 1964. Apparently, Ron Forse has done work there over the years.
Some really good players attended Bucknell since it was built especially from Pittsburgh.
Not a candidate for the top five, however.
{{ Full disclosure: I am a graduate and former student member. My father started buying me a semester membership Fall soph year for the princely sum of $38 ! }}