Stairs leading to a <a href="//commons.wikimedia.org/wiki/Category:Qanats" title="Category:Qanats">qanat</a> (cistern), Kashan.
Philippe Chavin (<a href="//commons.wikimedia.org/wiki/User:Simorg" title="User:Simorg">Simorg</a>)
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>