Grandpa’s Shingle Mill, the last shingle mill in Washington County, lies far down in the woods off the Halls Mills Road in Whiting. The mill, which is filled with shingles and logs and heavy with the sense of the past, is run by Philip Gardner, who said he remembers when there used to be shingle mills “on every corner. Every sawmill had a shingle machine. But now it’s a thing of the past.” The nearest one may be in East Corinth. “Back in the day…