Broken Circle / Spiral Hill (1971) by Robert Smithson in Emmen, the Netherlands. Broken Circle, as seen from Spiral Hill. Photographed during the 'open weekends' in honour of the 50th anniversary of the artwork in 2021.
<a href="//commons.wikimedia.org/wiki/User:Husky" title="User:Husky">Hay Kranen</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>