Great Circle Earthworks, part of the <a href="https://en.wikipedia.org/wiki/Newark_Earthworks" class="extiw" title="w:Newark Earthworks">Newark Earthworks</a> in <a href="https://en.wikipedia.org/wiki/Newark,_Ohio" class="extiw" title="w:Newark, Ohio">Newark, Ohio</a>, built by the <a href="https://en.wikipedia.org/wiki/Hopewell_culture" class="extiw" title="w:Hopewell culture">Hopewell culture</a> from <a href="https://en.wikipedia.org/wiki/100_BC" class="extiw" title="w:100 BC">100 BC</a> to <a href="https://en.wikipedia.org/wiki/500" class="extiw" title="w:500">500 AD</a>.
<a href="//commons.wikimedia.org/wiki/User:Ebyabe" title="User:Ebyabe">Ebyabe</a>
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<span class="int-own-work" lang="en">Own work</span>