Close-up of "pick holes" in a <a href="https://en.wikipedia.org/wiki/manhole_cover" class="extiw" title="w:manhole cover">manhole cover</a> in <a href="https://en.wikipedia.org/wiki/Palo_Alto,_California" class="extiw" title="w:Palo Alto, California">Palo Alto, California</a>.
<a href="https://en.wikipedia.org/wiki/User:Dante_Alighieri" class="extiw" title="en:User:Dante Alighieri">User:Dante Alighieri</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>