<p>The Pits of Elysium Mons
</p><p>The chain of pits likely formed by volcanic processes, such as the collapse of a lava tube after it drained.  
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NASA/JPL/University of Arizona
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2018-10-11 14:42
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/31562026838/">ESP_056026_2050</a>