No, shorter rather than tall. They are not farm-like silos. I've never really looked for or noticed stairs but I'd say their more like a stack of coasters than a Pringles can.
Anyway, I've wondered several times what they were. Best wishes.
"they're" not "their"
Sounds like a petroleum tank farm. You might discreetly ask around. See if you can figure out what the security is in and around the area and report back here. Don't get yourself arrested! But I'm betting that security is minimal. If that's the case, you might send an inquiry to the Governor of your state and see what the situation is. Maybe a BCC to the State Level DHS. That's what I'd do.