Returning to the Cave of the Mounds, this image shows some perspective on the size of the formation though the inclusion of the woman standing along the walkway. The distance recedes into darkness from the absence of lighting further down the pathway.

The simple description states:
The Hall of Statuary in the South Section at Cave of the Mounds, Blue Mounds, Wisconsin
The primitive handrail shown here, made out of plumbing pipe and connections, is typical of the kinds of safety provisions present in public access caves of that era.
The woman’s apparel is consistent with indications in other photos that this picture dates from the 1940s.