Another local historic site that I'd never visited—though, to be fair to myself, I had no idea this one existed, unlike the Seminary. Freeman's Mill, as it is known locally, was the last water-powered grist mill in operation in the area, running until 1986. (Long past the time when a water-powered grist mill would be any kind of efficient compared to modern techniques; so I guess it was hipster flour or something.)
It was built between 1868 and 1879. In 1880 it was producing 40 barrels of wheat flour, 14,500 pounds of corn meal and corn flour, and 54,000 pounds of animal feed annually. I have no clue if that's impressive or not, but it certainly seems like a lot of flour.
The dam which directed water to the mill has partly broken away, so the creek which powered it no longer goes directly to it; and the county raised the mill a bit to prevent flood damage. They're in the process of restoring the building, so you're not allowed inside yet. Still, it's a fairly impressive old building.