Alisadr cave, Near Hamadan, Iran.
35.2915193N 48.2901483E
<a href="//commons.wikimedia.org/wiki/User:Nasser-sadeghi" title="User:Nasser-sadeghi">Nasser-sadeghi</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>