Remain of the old level of lava flow in the Thurston Lava Tube, Kilauea, Hawaii, United States
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/9462200@N08">apasciuto</a> from New York, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/apasciuto/5015724611/">thurston lava tube</a>