1860s farm structure--can you identify?
I'm trying to identify the structure shown in the background of this engraving by Frank Leslie. I'm guessing that it might be a large water well or maybe a kind of hay press, but I can't find any photos of similar structures online, except in other drawings of farmyards. It must have been a common sight in the 1860s.
(In case you're interested, the drawing shows foragers ("Sherman's bummers") looting the property of a southern farm during Sherman's march to the sea.)