They originated in Ohio, and you can read more about them here:
All the Red Barn restaurants were designed in the shape of an actual barn. I was just thinking about them recently because it's been about 30+ years since they all closed down - yet the barns still remain intact in many places around my neck of the woods. They were never demolished, but instead turned into other restaurants/businesses. When Chi Chi's went out of business, almost every one of them were torn down or gutted and didn't resemble the original shape of the building at all. Same goes for the Pizza Hut's that closed down.