"Monopol", closed coal mine in Kamen, Germany near Dortmund, night shot. There were two shafts named "Grillo 1" and "Grillo 2". Only one has been kept for museal purposes.
<a href="//commons.wikimedia.org/wiki/User:Smial" title="User:Smial">Smial</a>
<span class="int-own-work" lang="en">Own work</span>