The Cathedral in the Waitomo Glowworm Caves system, looking back towards the main cave.  Stairs up can just be discerned in the distant background.  This was a 4 second exposure at ISO 800, without flash.  Only a limited amount of cave lighting was turned on due to flooding at the time.
<a href="//commons.wikimedia.org/wiki/User:Karora" title="User:Karora">Karora</a>
2007-10-12
<span class="int-own-work" lang="en">Own work</span>