I doubt they were grain stores, but elevators in the USA store grain and corn like that all the time in a pyramid shape and it doesn&#x27;t hurt the grain &#x2F; corn (other than moisture).<p>There is a &quot;ski Indiana&quot; photoshop showing a skier on one of these grain hills.<p>Here is a nice little pdf with a lot of ways we store product <a href="http:&#x2F;&#x2F;calculators.agstar.com&#x2F;uploads&#x2F;GrainStorageMethods0707.pdf" rel="nofollow">http:&#x2F;&#x2F;calculators.agstar.com&#x2F;uploads&#x2F;GrainStorageMethods070...</a><p>[edit: I agree they would have been a bad shape of an old style grain store, plus wrong era]