The Old Stone Fort near Isleta, Ohio is believed to be the oldest structure in the state. Although, there are no records that could tell how long has the building been around, historians and other experts theorize that it could be originally constructed in the 1700s as a fort to protect locals from raiding bandits and renegade Indians.

Interest on the history of the Old Stone Fort started around the 1900s. The first restoration happened in the 1950s. The effort was initiated by the Coshocton County Historical Society when they bought the fort and asked for donations through the local newspapers. They managed to raise $2000, which made it possible to restore the building to its original shape.

No one is in charge of the Old Stone Fort today, as the Coshocton County Historical Society dissolved years ago. However, the restoration done more than 50 years ago is still fairly intact.