Mysterious Old Stone Fort along the Tuscarawas River in Coshocton cty.

 One of the great mysteries of Ohio history is the identity of the builder of the Old Stone Fort located on the south bank of the swift flowing Tuscarawas River in Coshocton county, a mile from the hamlet of Isleta.  Here is a website with more info:

http://www.midwesternepigraphic.org/croghan.html

The Old Stone Fort, claimed to be the oldest standing
building west of the Appalachians.
The object on the left near the base is a granite marker
with the names of all the donors to the restoration done
in the 1950s.

Close up of plaque on building.  

The Tuscarawas from the St Rt 751 bridge, just south
of US 36.  Looking west.