This map is a draft of Fort Sullivan drawn by Col. Israel Shreve's in 1779 during the campaign against the British backed Iroquois Indians.
The fort was situated next to the Tioga River on the Pennsylvania and New York border. If you would like to read more about the campaign click here and here.
Doesn't look too bad for being a couple of hundred years old does it?
PS: Don't forget to enter the "Name this photo" contest from yesterday. Let's give Jen from Sprite's Keeper a little competition.