Here is a picture of the old Tory Fort in the col of KHP and Round Top Mountain:

I a taking the picture from inside the doorway. You can still see 2 tiers of the wall on the middle-right side of the screen. The moss is on the floor. You can also see some of the other rooms.
Talked with a local historian. He said that the fort was right where I looked. Said that there would be very little left now. Also said that the purpose of the fort was to catch defectors during the revolutionary war.
I would like to return and measure the rooms out. I would also like to find the right ledge for the trail, and get an updated gps tracks.