Photo of underground cavern and cistern at ancient ruin, Eid el-Mieh (the Arabic corruption for Adullam), near the Elah valley in Israel.
<a href="//commons.wikimedia.org/wiki/User:Davidbena" title="User:Davidbena">Davidbena</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>