In Hawaii Volcanoes National Park.
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/7702002@N08">Ethan Hein</a> from Brooklyn, United States
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/ethanhein/5203383138/">Kilauea Iki crater hike</a>