This barn was used for holding animal feed in a drying area along with a hay loft in the upper half where you'd keep your hay bails dry and throw them down into your wagon from the upper opening.
I spent many days of my childhood climbing through that barn and running and playing in the hay loft. We mounted a zip line from one end to the other.
This tobacco barn was built by my grandfather who was a tobacco farmer. The entire barn was open because when the tobacco came out of the fields, it would need to be dried. So the leaves would be hung all in the rafters.
The photo below on the right shows that the entire barn was picked up and moved ~5ft off it's foundation.