Large billboards that say "Hell is real!" Or something similar. They are so frequent in the more remote areas that it has been noticed by other parts of the world. Those wacky Evangelicals at it again. Those little rascals.
It's really just the set of 2 billboards right next to each other on 71 between Cincinnati and Columbus. On the reverse sides they've got the 10 commandments. The annual match between Columbus Crew and FC Cincinnati is known as the "Hell is Real" match.
There actually are a few more scattered about in the smaller town areas, but for the sake of not identifying my location any further, I will leave that up to people to find on their own.